Provided is a system and a method for reporting data in a Local Area Network (LAN), which includes at least one router for broadcasting both product information of an entire shopping center including product advertisement information and product information including identification information of each of shopping center local communication terminals providing the product advertisement information, and identification information of each of shopping center local communication terminals located within a coverage area of each of the at least one router; and a user local communication terminal for receiving the product information and the identification information, detecting the product advertisement information and displaying the detected product advertisement information, finding product information including any one of the received identification information among the received product information of the entire shopping center, analyzing the found product information to detect product advertisement information of the found product information, and first displaying the detected product advertisement information.