diff --git a/src/main/java/clap/server/adapter/inbound/web/admin/AddCategoryController.java b/src/main/java/clap/server/adapter/inbound/web/admin/AddCategoryController.java
index e5b841fb..584726c4 100644
--- a/src/main/java/clap/server/adapter/inbound/web/admin/AddCategoryController.java
+++ b/src/main/java/clap/server/adapter/inbound/web/admin/AddCategoryController.java
@@ -18,7 +18,7 @@
 @Tag(name = "05. Admin")
 @WebAdapter
 @RequiredArgsConstructor
-@RequestMapping("/api/management")
+@RequestMapping("/api/managements")
 public class AddCategoryController {
     private final AddCategoryUsecase addCategoryUsecase;
 
diff --git a/src/main/java/clap/server/adapter/inbound/web/admin/DeleteCategoryController.java b/src/main/java/clap/server/adapter/inbound/web/admin/DeleteCategoryController.java
index 82126fff..e4c0c194 100644
--- a/src/main/java/clap/server/adapter/inbound/web/admin/DeleteCategoryController.java
+++ b/src/main/java/clap/server/adapter/inbound/web/admin/DeleteCategoryController.java
@@ -15,7 +15,7 @@
 @Tag(name = "05. Admin")
 @WebAdapter
 @RequiredArgsConstructor
-@RequestMapping("/api/management")
+@RequestMapping("/api/managements")
 public class DeleteCategoryController {
     private final DeleteCategoryUsecase deleteCategoryUsecase;
 
diff --git a/src/main/java/clap/server/adapter/inbound/web/admin/FindCategoryController.java b/src/main/java/clap/server/adapter/inbound/web/admin/FindCategoryController.java
index ea1d7725..bc2ed571 100644
--- a/src/main/java/clap/server/adapter/inbound/web/admin/FindCategoryController.java
+++ b/src/main/java/clap/server/adapter/inbound/web/admin/FindCategoryController.java
@@ -27,7 +27,7 @@ public class FindCategoryController {
 
     @Operation(summary = "모든 카테고리 조회")
     @GetMapping("/category")
-    public ResponseEntity<FindAllCategoryResponse> findAllCategory() {
+    public ResponseEntity<List<FindAllCategoryResponse>> findAllCategory() {
         return ResponseEntity.ok(findAllCategoryUsecase.findAllCategory());
     }
 
diff --git a/src/main/java/clap/server/adapter/inbound/web/admin/UpdateCategoryController.java b/src/main/java/clap/server/adapter/inbound/web/admin/UpdateCategoryController.java
index 9ccc7731..9ec32397 100644
--- a/src/main/java/clap/server/adapter/inbound/web/admin/UpdateCategoryController.java
+++ b/src/main/java/clap/server/adapter/inbound/web/admin/UpdateCategoryController.java
@@ -17,7 +17,7 @@
 @Tag(name = "05. Admin")
 @WebAdapter
 @RequiredArgsConstructor
-@RequestMapping("/api/management")
+@RequestMapping("/api/managements")
 public class UpdateCategoryController {
     private final UpdateCategoryUsecase updateCategoryUsecase;
 
diff --git a/src/main/java/clap/server/adapter/inbound/web/dto/admin/FindAllCategoryResponse.java b/src/main/java/clap/server/adapter/inbound/web/dto/admin/FindAllCategoryResponse.java
index 74dc547a..46febb93 100644
--- a/src/main/java/clap/server/adapter/inbound/web/dto/admin/FindAllCategoryResponse.java
+++ b/src/main/java/clap/server/adapter/inbound/web/dto/admin/FindAllCategoryResponse.java
@@ -3,7 +3,9 @@
 import java.util.List;
 
 public record FindAllCategoryResponse(
-        List<FindMainCategoryResponse> mainCategory,
+        Long id,
+        String name,
+        String code,
         List<FindSubCategoryResponse> subCategory
 ) {
 }
diff --git a/src/main/java/clap/server/application/mapper/response/CategoryResponseMapper.java b/src/main/java/clap/server/application/mapper/response/CategoryResponseMapper.java
index 19b780fd..663637b7 100644
--- a/src/main/java/clap/server/application/mapper/response/CategoryResponseMapper.java
+++ b/src/main/java/clap/server/application/mapper/response/CategoryResponseMapper.java
@@ -10,9 +10,11 @@
 public class CategoryResponseMapper {
 
     public static FindAllCategoryResponse toFindAllCategoryResponse(
-            List<FindMainCategoryResponse> mainCategoryResponses,
+            Long id,
+            String name,
+            String code,
             List<FindSubCategoryResponse> subCategoryResponses) {
-        return new FindAllCategoryResponse(mainCategoryResponses, subCategoryResponses);
+        return new FindAllCategoryResponse(id, name, code, subCategoryResponses);
     }
 
     public static FindMainCategoryResponse toFindMainCategoryResponse(Category category) {
diff --git a/src/main/java/clap/server/application/port/inbound/admin/FindAllCategoryUsecase.java b/src/main/java/clap/server/application/port/inbound/admin/FindAllCategoryUsecase.java
index e9c3c26d..03968603 100644
--- a/src/main/java/clap/server/application/port/inbound/admin/FindAllCategoryUsecase.java
+++ b/src/main/java/clap/server/application/port/inbound/admin/FindAllCategoryUsecase.java
@@ -2,6 +2,8 @@
 
 import clap.server.adapter.inbound.web.dto.admin.FindAllCategoryResponse;
 
+import java.util.List;
+
 public interface FindAllCategoryUsecase {
-    FindAllCategoryResponse findAllCategory();
+    List<FindAllCategoryResponse> findAllCategory();
 }
diff --git a/src/main/java/clap/server/application/service/admin/DeleteCategoryService.java b/src/main/java/clap/server/application/service/admin/DeleteCategoryService.java
index bbff33d4..f490bd5e 100644
--- a/src/main/java/clap/server/application/service/admin/DeleteCategoryService.java
+++ b/src/main/java/clap/server/application/service/admin/DeleteCategoryService.java
@@ -1,7 +1,7 @@
 package clap.server.application.service.admin;
 
 import clap.server.application.port.inbound.admin.DeleteCategoryUsecase;
-import clap.server.application.port.outbound.member.LoadMemberPort;
+import clap.server.application.port.inbound.domain.MemberService;
 import clap.server.application.port.outbound.task.LoadCategoryPort;
 import clap.server.common.annotation.architecture.ApplicationService;
 import clap.server.domain.model.member.Member;
@@ -9,19 +9,18 @@
 import lombok.RequiredArgsConstructor;
 import org.springframework.transaction.annotation.Transactional;
 
-import static clap.server.exception.code.MemberErrorCode.ACTIVE_MEMBER_NOT_FOUND;
 import static clap.server.exception.code.TaskErrorCode.CATEGORY_NOT_FOUND;
 
 @ApplicationService
 @RequiredArgsConstructor
 public class DeleteCategoryService implements DeleteCategoryUsecase {
     private final LoadCategoryPort loadCategoryPort;
-    private final LoadMemberPort loadMemberPort;
+    private final MemberService memberService;
 
     @Override
     @Transactional
     public void deleteCategory(Long adminId, Long categoryId) {
-        Member admin = loadMemberPort.findActiveMemberById(adminId).orElseThrow(() -> new ApplicationException(ACTIVE_MEMBER_NOT_FOUND));
+        Member admin = memberService.findActiveMember(adminId);
         loadCategoryPort.findById(categoryId)
                 .orElseThrow(() -> new ApplicationException(CATEGORY_NOT_FOUND))
                 .deleteCategory(admin);
diff --git a/src/main/java/clap/server/application/service/admin/FindAllCategoryService.java b/src/main/java/clap/server/application/service/admin/FindAllCategoryService.java
index 6fe93c55..27fe7c76 100644
--- a/src/main/java/clap/server/application/service/admin/FindAllCategoryService.java
+++ b/src/main/java/clap/server/application/service/admin/FindAllCategoryService.java
@@ -1,16 +1,15 @@
 package clap.server.application.service.admin;
 
 import clap.server.adapter.inbound.web.dto.admin.FindAllCategoryResponse;
-import clap.server.adapter.inbound.web.dto.admin.FindMainCategoryResponse;
 import clap.server.adapter.inbound.web.dto.admin.FindSubCategoryResponse;
 import clap.server.application.mapper.response.CategoryResponseMapper;
 import clap.server.application.port.inbound.admin.FindAllCategoryUsecase;
 import clap.server.application.port.outbound.task.LoadCategoryPort;
 import clap.server.common.annotation.architecture.ApplicationService;
+import clap.server.domain.model.task.Category;
 import lombok.RequiredArgsConstructor;
 import org.springframework.transaction.annotation.Transactional;
 
-import java.util.ArrayList;
 import java.util.List;
 
 @ApplicationService
@@ -20,16 +19,23 @@ public class FindAllCategoryService implements FindAllCategoryUsecase {
 
     @Override
     @Transactional(readOnly = true)
-    public FindAllCategoryResponse findAllCategory() {
-        List<FindMainCategoryResponse> mainCategoryResponses = new ArrayList<>();
-        List<FindSubCategoryResponse> subCategoryResponses = new ArrayList<>();
-        loadCategoryPort.findAll().forEach(category -> {
-            if (category.getMainCategory() == null) {
-                mainCategoryResponses.add(CategoryResponseMapper.toFindMainCategoryResponse(category));
-            } else {
-                subCategoryResponses.add(CategoryResponseMapper.toFindSubCategoryResponse(category));
-            }
-        });
-        return CategoryResponseMapper.toFindAllCategoryResponse(mainCategoryResponses, subCategoryResponses);
+    public List<FindAllCategoryResponse> findAllCategory() {
+        List<Category> categories = loadCategoryPort.findAll();
+        return categories.stream().filter(category -> category.getMainCategory() == null)
+                .map(parent -> CategoryResponseMapper.toFindAllCategoryResponse(
+                        parent.getCategoryId(),
+                        parent.getName(),
+                        parent.getCode(),
+                        getSubCategories(categories, parent) // 2차 카테고리 리스트 변환
+                ))
+                .toList();
+    }
+
+    private List<FindSubCategoryResponse> getSubCategories(List<Category> categories, Category parent) {
+        return categories.stream()
+                .filter(category -> category.getMainCategory() != null &&
+                                    category.getMainCategory().getCategoryId().equals(parent.getCategoryId())) // 부모가 같은 것들 필터링
+                .map(CategoryResponseMapper::toFindSubCategoryResponse)
+                .toList();
     }
 }
\ No newline at end of file