diff --git a/src/main/java/treehouse/server/api/invitation/business/InvitationMapper.java b/src/main/java/treehouse/server/api/invitation/business/InvitationMapper.java
index 27c7b8c..f48d16f 100644
--- a/src/main/java/treehouse/server/api/invitation/business/InvitationMapper.java
+++ b/src/main/java/treehouse/server/api/invitation/business/InvitationMapper.java
@@ -30,5 +30,18 @@ public InvitationResponseDTO.getInvitations toGetInvitations(List<InvitationResp
                 .invitations(invitationDtos)
                 .build();
     }
+
+    public InvitationResponseDTO.myInvitationInfo toMyInvitationInfo(User user){
+        return InvitationResponseDTO.myInvitationInfo.builder()
+                .availableInvitation(user.getInvitationCount())
+                .activeRate(user.getActiveRate())
+                .build();
+    }
+
+    public InvitationResponseDTO.invitationAccept toInvitationResult(Long treeHouseId){
+        return InvitationResponseDTO.invitationAccept.builder()
+                .treehouseId(treeHouseId)
+                .build();
+    }
 }
 
diff --git a/src/main/java/treehouse/server/api/invitation/business/InvitationService.java b/src/main/java/treehouse/server/api/invitation/business/InvitationService.java
index 5e2aeaf..29b85ec 100644
--- a/src/main/java/treehouse/server/api/invitation/business/InvitationService.java
+++ b/src/main/java/treehouse/server/api/invitation/business/InvitationService.java
@@ -11,14 +11,7 @@
 import treehouse.server.global.entity.Invitation.Invitation;
 import treehouse.server.global.entity.User.User;
 import treehouse.server.global.entity.member.Member;
-import treehouse.server.global.entity.redis.RefreshToken;
 import treehouse.server.global.entity.treeHouse.TreeHouse;
-import treehouse.server.global.exception.GlobalErrorCode;
-import treehouse.server.global.exception.ThrowClass.AuthException;
-import treehouse.server.global.exception.ThrowClass.GeneralException;
-import treehouse.server.global.redis.service.RedisService;
-import treehouse.server.global.security.jwt.dto.TokenDTO;
-import treehouse.server.global.security.provider.TokenProvider;
 
 import java.util.List;
 import java.util.stream.Collectors;
@@ -39,10 +32,7 @@ public class InvitationService {
     @Transactional
     public InvitationResponseDTO.getInvitations getInvitations(User user) {
 
-        log.error("User name : ", user.getName());
-        log.error("User id : ", user.getId());
         List<Invitation> invitations = invitationQueryAdapter.findAllByPhone(user.getPhone());
-        log.error("size : ", invitations.size());
 
         List<InvitationResponseDTO.getInvitation> invitationDtos = invitations.stream()
                 .map(invitation -> {
@@ -57,4 +47,18 @@ public InvitationResponseDTO.getInvitations getInvitations(User user) {
                 .collect(Collectors.toList());
         return invitationMapper.toGetInvitations(invitationDtos);
     }
+
+    public InvitationResponseDTO.myInvitationInfo getMyInvitationInfo(User user){
+        return invitationMapper.toMyInvitationInfo(user);
+    }
+
+    @Transactional
+    public InvitationResponseDTO.invitationAccept decisionInvitation(User user, InvitationRequestDTO.invitationAcceptDecision request){
+        // 해당 User 에게 온 초대장인지 검증하는 로직 추가
+        Long treehouseId = 0L;
+        if (request.isAcceptDecision()==true) {
+            treehouseId = 1L; // treehouse 관련 로직 개발 후, invitation.getTreeHouse.getId() 등으로 바꾸기
+        }
+        return invitationMapper.toInvitationResult(treehouseId);
+    }
 }
diff --git a/src/main/java/treehouse/server/api/invitation/presentation/InvitationApi.java b/src/main/java/treehouse/server/api/invitation/presentation/InvitationApi.java
index f3c1bfa..430c331 100644
--- a/src/main/java/treehouse/server/api/invitation/presentation/InvitationApi.java
+++ b/src/main/java/treehouse/server/api/invitation/presentation/InvitationApi.java
@@ -18,7 +18,7 @@
 @RequiredArgsConstructor
 @Slf4j
 @Validated
-@Tag(name = "😎 Invitation API", description = "초대장 관련 API 입니다. 초대장 조회, 전송 등의 API가 포함됩니다.")
+@Tag(name = "📨 Invitation API", description = "초대장 관련 API 입니다. 초대장 조회, 전송 등의 API가 포함됩니다.")
 @RequestMapping("/users")
 public class InvitationApi {
 
@@ -32,5 +32,18 @@ public CommonResponse<InvitationResponseDTO.getInvitations> getInvitations(
         return CommonResponse.onSuccess(invitationService.getInvitations(user));
     }
 
+    @GetMapping("/availableInvitation")
+    @Operation(summary = "소유한 초대장 개수 및 게이지 조회", description = "소유한 초대장 개수 및 게이지를 조회합니다.")
+    public CommonResponse<InvitationResponseDTO.myInvitationInfo> getAvailableInvitation(@AuthMember @Parameter(hidden = true) User user){
+
+        return CommonResponse.onSuccess(invitationService.getMyInvitationInfo(user));
+    }
+
+    @PostMapping("/invitations/accept")
+    @Operation(summary = "초대장을 수락할지 거절할지 결정", description = "초대장을 수락할지 거절할지 결정하는 API 입니다.")
+    public CommonResponse<InvitationResponseDTO.invitationAccept> acceptInvitation(
+            @AuthMember @Parameter(hidden = true) User user, @RequestBody InvitationRequestDTO.invitationAcceptDecision request) {
+        return CommonResponse.onSuccess(invitationService.decisionInvitation(user, request));
+    }
 
 }
diff --git a/src/main/java/treehouse/server/api/invitation/presentation/dto/InvitationRequestDTO.java b/src/main/java/treehouse/server/api/invitation/presentation/dto/InvitationRequestDTO.java
index aeb894a..0e51853 100644
--- a/src/main/java/treehouse/server/api/invitation/presentation/dto/InvitationRequestDTO.java
+++ b/src/main/java/treehouse/server/api/invitation/presentation/dto/InvitationRequestDTO.java
@@ -1,18 +1,17 @@
 package treehouse.server.api.invitation.presentation.dto;
 
-import jakarta.validation.constraints.NotBlank;
-import jakarta.validation.constraints.NotNull;
-import lombok.AllArgsConstructor;
-import lombok.Builder;
-import lombok.Getter;
-import lombok.NoArgsConstructor;
-
-import java.util.List;
+import lombok.*;
 
 
 public class InvitationRequestDTO {
 
+    @Getter
+    @NoArgsConstructor
+    public static class invitationAcceptDecision{
+        private Long invitationId;
+        private boolean acceptDecision;
 
+    }
 
 
 }
diff --git a/src/main/java/treehouse/server/api/invitation/presentation/dto/InvitationResponseDTO.java b/src/main/java/treehouse/server/api/invitation/presentation/dto/InvitationResponseDTO.java
index 685489d..717db23 100644
--- a/src/main/java/treehouse/server/api/invitation/presentation/dto/InvitationResponseDTO.java
+++ b/src/main/java/treehouse/server/api/invitation/presentation/dto/InvitationResponseDTO.java
@@ -28,4 +28,21 @@ public static class getInvitations {
         List<InvitationResponseDTO.getInvitation> invitations;
     }
 
+    @Builder
+    @Getter
+    @NoArgsConstructor
+    @AllArgsConstructor
+    public static class myInvitationInfo{
+        private Integer availableInvitation;
+        private Integer activeRate;
+    }
+
+    @Builder
+    @Getter
+    @NoArgsConstructor
+    @AllArgsConstructor
+    public static class invitationAccept {
+        private Long treehouseId;
+
+    }
 }
diff --git a/src/main/java/treehouse/server/global/entity/User/User.java b/src/main/java/treehouse/server/global/entity/User/User.java
index 265c907..1522ef7 100644
--- a/src/main/java/treehouse/server/global/entity/User/User.java
+++ b/src/main/java/treehouse/server/global/entity/User/User.java
@@ -36,10 +36,11 @@ public class User extends BaseDateTimeEntity {
 
     // 활동량 및 초대장 개수 트리별로 적용되는 것 맞는지 확인하기
     @Builder.Default
-    private Double activeRate = 0.0; //활동량
+    private Integer activeRate = 0; //활동량
     @Builder.Default
     private Integer invitationCount = 3; //남아있는 초대장의 개수
 
+
     // 탈퇴일자 필요한지 확인하기
     // 특정 트리의 탈퇴한 멤버를 Member Table 에 그대로 쌓을건지?
     // db의 Member Table에 userId 필드 값은 그대로 두는지 or -1 등으로 갱신하는지