diff --git a/src/main/java/com/eactive/httpmockserver/ApiController.java b/src/main/java/com/eactive/httpmockserver/ApiController.java
index 842c528..5a9f7b1 100644
--- a/src/main/java/com/eactive/httpmockserver/ApiController.java
+++ b/src/main/java/com/eactive/httpmockserver/ApiController.java
@@ -8,6 +8,8 @@ import javax.servlet.http.HttpServletResponse;
 
 import org.apache.commons.lang3.StringUtils;
 import org.apache.commons.lang3.math.NumberUtils;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
 import org.springframework.beans.factory.annotation.Autowired;
 import org.springframework.http.HttpEntity;
 import org.springframework.http.HttpHeaders;
@@ -23,6 +25,8 @@ import com.jayway.jsonpath.JsonPath;
 
 @Controller
 public class ApiController {
+	private final Logger logger = LoggerFactory.getLogger(this.getClass());
+
 	@Autowired
 	private ApiServiceKeyService apiKeyService;
 
@@ -33,25 +37,25 @@ public class ApiController {
 	@RequestMapping(value = "/mock-api/**")
 	public ResponseEntity<String> mockApi(HttpEntity<String> httpEntity, HttpServletRequest request,
 			HttpServletResponse response) {
-		System.out.println("==================================================");
-		System.out.println("==================================================");
-		System.out.println(request.getServletPath());
-		System.out.println("--------------------------------------------------");
-		System.out.println("httpEntity.getHeaders().toString()=" + httpEntity.getHeaders().toString());
-		System.out.println("--------------------------------------------------");
-		System.out.println("httpEntity.getBody()=" + httpEntity.getBody());
-		System.out.println("--------------------------------------------------");
+		logger.debug("==================================================");
+		logger.debug("==================================================");
+		logger.debug(request.getServletPath());
+		logger.debug("--------------------------------------------------");
+		logger.debug("httpEntity.getHeaders().toString()=" + httpEntity.getHeaders().toString());
+		logger.debug("--------------------------------------------------");
+		logger.debug("httpEntity.getBody()=" + httpEntity.getBody());
+		logger.debug("--------------------------------------------------");
 
 		Map<String, String[]> paramMap = request.getParameterMap();
 		for (String key : paramMap.keySet()) {
 			String[] values = paramMap.get(key);
 			for (String value : values) {
-				System.out.println(String.format("%s=%s", key, value));
+				logger.debug(String.format("%s=%s", key, value));
 			}
 		}
 
-		System.out.println("==================================================");
-		System.out.println("==================================================");
+		logger.debug("==================================================");
+		logger.debug("==================================================");
 
 		String url = request.getServletPath();
 		String serviceValue = assignServiceValue(httpEntity, request, url);
@@ -122,10 +126,10 @@ public class ApiController {
 			int startIdx = NumberUtils.toInt(args[0]);
 			int length = NumberUtils.toInt(args[1]);
 			String serviceValue = msg.substring(startIdx, startIdx + length);
-			System.out.println("--------------------------------------------------");
-			System.out.println("serviceCode=" + serviceValue);
-			System.out.println("==================================================");
-			System.out.println("==================================================");
+			logger.debug("--------------------------------------------------");
+			logger.debug("serviceCode=" + serviceValue);
+			logger.debug("==================================================");
+			logger.debug("==================================================");
 			if (StringUtils.isBlank(serviceValue)) {
 				throw new ResponseStatusException(HttpStatus.NOT_FOUND,
 						String.format("sbi-std-servlet not found(URL=%s, ServiceKey=%s)", url, serviceKey));
diff --git a/src/main/resources/application.yml b/src/main/resources/application.yml
index 1b0c1ec..f5784ad 100644
--- a/src/main/resources/application.yml
+++ b/src/main/resources/application.yml
@@ -1,3 +1,6 @@
+logging:
+  level:
+    root: info
 server:
   port.http: 38080
   port: 38443