Providing information in interworking between mobile communication network and wireless local area network

A method and system for providing information on mobile communication network-WLAN interworking are provided. In the mobile communication network-WLAN interworking system, interworking WLAN information is broadcast from a mobile communication network to a dual terminal, which has a mobile communication network interface and a WLAN interface. Upon receipt of a broadcasting message including information on an interworking WLAN, the dual terminal turns on its WLAN module and periodically scans for a nearby WLAN in a power save mode. Upon receipt of a broadcasting message including no interworking WLAN information, the dual terminal turns off the WLAN module.