diff --git a/backend-node/src/app.ts b/backend-node/src/app.ts
index 3b281d19..be12bcad 100644
--- a/backend-node/src/app.ts
+++ b/backend-node/src/app.ts
@@ -29,7 +29,7 @@ app.use(express.urlencoded({ extended: true, limit: "10mb" }));
 // CORS 설정
 app.use(
   cors({
-    origin: config.cors.origin,
+    origin: config.cors.origin.split(',').map(url => url.trim()),
     credentials: true,
     methods: ["GET", "POST", "PUT", "DELETE", "PATCH", "OPTIONS"],
     allowedHeaders: ["Content-Type", "Authorization", "X-Requested-With"],
diff --git a/backend-node/src/config/environment.ts b/backend-node/src/config/environment.ts
index be936f76..56478ae3 100644
--- a/backend-node/src/config/environment.ts
+++ b/backend-node/src/config/environment.ts
@@ -82,8 +82,8 @@ const config: Config = {
 
   // CORS 설정
   cors: {
-    origin: process.env.CORS_ORIGIN || "http://localhost:9771",
-    credentials: process.env.CORS_CREDENTIALS === "true",
+    origin: process.env.CORS_ORIGIN || "http://localhost:9771,http://192.168.0.70:5555,http://39.117.244.52:5555",
+    credentials: process.env.CORS_CREDENTIALS === "true" || true,
   },
 
   // 로깅 설정
diff --git a/frontend/lib/api/client.ts b/frontend/lib/api/client.ts
index e3eef389..5404774a 100644
--- a/frontend/lib/api/client.ts
+++ b/frontend/lib/api/client.ts
@@ -1,7 +1,30 @@
 import axios, { AxiosResponse, AxiosError } from "axios";
 
-// API 기본 URL 설정
-export const API_BASE_URL = process.env.NEXT_PUBLIC_API_URL || "http://localhost:8080/api";
+// API 기본 URL 동적 설정 (클라이언트 사이드에서 현재 도메인 기반으로 결정)
+const getApiBaseUrl = (): string => {
+  if (typeof window !== 'undefined') {
+    const currentHost = window.location.hostname;
+    const currentPort = window.location.port;
+    
+    // 외부 IP로 접근한 경우
+    if (currentHost === '39.117.244.52') {
+      return 'http://39.117.244.52:8080/api';
+    }
+    // 내부 IP로 접근한 경우
+    else if (currentHost === '192.168.0.70') {
+      return 'http://192.168.0.70:8080/api';
+    }
+    // localhost로 접근한 경우
+    else if (currentHost === 'localhost' || currentHost === '127.0.0.1') {
+      return 'http://localhost:8080/api';
+    }
+  }
+  
+  // 서버 사이드 렌더링이나 기본값
+  return process.env.NEXT_PUBLIC_API_URL || "http://39.117.244.52:8080/api";
+};
+
+export const API_BASE_URL = getApiBaseUrl();
 
 // JWT 토큰 관리 유틸리티
 const TokenManager = {
diff --git a/frontend/next.config.mjs b/frontend/next.config.mjs
index 286faf4a..5323571a 100644
--- a/frontend/next.config.mjs
+++ b/frontend/next.config.mjs
@@ -43,7 +43,7 @@ const nextConfig = {
 
   // 환경 변수 (런타임에 읽기)
   env: {
-    NEXT_PUBLIC_API_URL: process.env.NEXT_PUBLIC_API_URL || "http://192.168.0.70:8080/api",
+    NEXT_PUBLIC_API_URL: process.env.NEXT_PUBLIC_API_URL || "http://39.117.244.52:8080/api",
   },
 };