diff --git a/src/main/kotlin/dev/usbharu/hideout/domain/model/ActivityPubResponse.kt b/src/main/kotlin/dev/usbharu/hideout/domain/model/ActivityPubResponse.kt
new file mode 100644
index 00000000..8e487b7c
--- /dev/null
+++ b/src/main/kotlin/dev/usbharu/hideout/domain/model/ActivityPubResponse.kt
@@ -0,0 +1,5 @@
+package dev.usbharu.hideout.domain.model
+
+import io.ktor.http.*
+
+data class ActivityPubResponse(val httpStatusCode: HttpStatusCode, val message:String)
diff --git a/src/main/kotlin/dev/usbharu/hideout/routing/activitypub/InboxRouting.kt b/src/main/kotlin/dev/usbharu/hideout/routing/activitypub/InboxRouting.kt
index fc08e892..079ddb98 100644
--- a/src/main/kotlin/dev/usbharu/hideout/routing/activitypub/InboxRouting.kt
+++ b/src/main/kotlin/dev/usbharu/hideout/routing/activitypub/InboxRouting.kt
@@ -20,8 +20,12 @@ fun Routing.inbox(httpSignatureVerifyService: HttpSignatureVerifyService,activit
                 }
                 val json = call.receiveText()
                 val activityTypes = activityPubService.parseActivity(json)
-                activityPubService.processActivity(json,activityTypes)
-                call.respond(HttpStatusCode.NotImplemented)
+                val response = activityPubService.processActivity(json, activityTypes)
+                return@post if (response != null) {
+                    call.respond(response.httpStatusCode, response.message)
+                }else {
+                    call.respond(HttpStatusCode.InternalServerError)
+                }
             }
         }
         route("/users/{name}/inbox"){
diff --git a/src/main/kotlin/dev/usbharu/hideout/service/activitypub/ActivityPubService.kt b/src/main/kotlin/dev/usbharu/hideout/service/activitypub/ActivityPubService.kt
index 070046a3..7723ca1b 100644
--- a/src/main/kotlin/dev/usbharu/hideout/service/activitypub/ActivityPubService.kt
+++ b/src/main/kotlin/dev/usbharu/hideout/service/activitypub/ActivityPubService.kt
@@ -1,9 +1,11 @@
 package dev.usbharu.hideout.service.activitypub
 
+import dev.usbharu.hideout.domain.model.ActivityPubResponse
+
 interface ActivityPubService {
     fun parseActivity(json:String): ActivityType
 
-    fun processActivity(json:String, type: ActivityType)
+    fun processActivity(json:String, type: ActivityType):ActivityPubResponse?
 }
 
 enum class ActivityType {
diff --git a/src/main/kotlin/dev/usbharu/hideout/service/activitypub/ActivityPubServiceImpl.kt b/src/main/kotlin/dev/usbharu/hideout/service/activitypub/ActivityPubServiceImpl.kt
index 9e238c7f..a9ea3b7f 100644
--- a/src/main/kotlin/dev/usbharu/hideout/service/activitypub/ActivityPubServiceImpl.kt
+++ b/src/main/kotlin/dev/usbharu/hideout/service/activitypub/ActivityPubServiceImpl.kt
@@ -2,6 +2,7 @@ package dev.usbharu.hideout.service.activitypub
 
 import com.fasterxml.jackson.databind.JsonNode
 import dev.usbharu.hideout.config.Config
+import dev.usbharu.hideout.domain.model.ActivityPubResponse
 import dev.usbharu.hideout.exception.JsonParseException
 
 class ActivityPubServiceImpl : ActivityPubService {
@@ -19,7 +20,7 @@ class ActivityPubServiceImpl : ActivityPubService {
         return ActivityType.values().first { it.name.equals(type.asText(), true) }
     }
 
-    override fun processActivity(json: String, type: ActivityType) {
+    override fun processActivity(json: String, type: ActivityType): ActivityPubResponse? {
         when (type) {
             ActivityType.Accept -> TODO()
             ActivityType.Add -> TODO()
diff --git a/src/test/kotlin/dev/usbharu/hideout/routing/activitypub/UsersAPTest.kt b/src/test/kotlin/dev/usbharu/hideout/routing/activitypub/UsersAPTest.kt
index 7eca6e24..fee20a11 100644
--- a/src/test/kotlin/dev/usbharu/hideout/routing/activitypub/UsersAPTest.kt
+++ b/src/test/kotlin/dev/usbharu/hideout/routing/activitypub/UsersAPTest.kt
@@ -1,5 +1,6 @@
 package dev.usbharu.hideout.routing.activitypub
 
+import dev.usbharu.hideout.domain.model.ActivityPubResponse
 import dev.usbharu.hideout.plugins.configureRouting
 import dev.usbharu.hideout.service.activitypub.ActivityPubService
 import dev.usbharu.hideout.service.activitypub.ActivityType
@@ -30,7 +31,7 @@ class UsersAPTest {
                     TODO("Not yet implemented")
                 }
 
-                override fun processActivity(json: String, type: ActivityType) {
+                override fun processActivity(json: String, type: ActivityType): ActivityPubResponse? {
                     TODO("Not yet implemented")
                 }
             })