Method, system and device for service selection via a wireless local area network

A a service system and method and terminal and method for data network, system and terminal. The method comprises via the WLAN connection point is WLAN terminal used for accessing network identification code (NAI), wherein accessing identification code (NAI) includes a service selection, in authentication server for receiving the service and a wherein the accessing identification code, to the WLAN terminal to provide formed by the indicator and connection of service. The system comprises at least wireless (wireless) point; and at least one WLAN terminal, and at least authentication server, wherein the WLAN terminal comprises for accessing identification code (NAI) comprises service and a device, and is via the WLAN connection point transmission inclined to the service and a wherein the NAI device; the authentication server comprises a receiving comprises a service and a a NAI device, from the NAI extracting to the service and a device, and a start to of the service and a to interface service device of connector.