Patent ID: 8194586

Claim:
A cellular phone terminal having built-in wireless LAN comprising a cellular phone network transmitter/receiver section for enabling to communicate with another terminal in the cellular phone network by way of a cellular phone basestation, a wireless LAN transmitter/receiver section, and an SSID/MAC address management section connected to a wireless LAN connection control section for controlling the connection of the wireless LAN transmitter/receiver section and the cellular phone network transmitter/receiver section, wherein the SSID/MAC address management section holds and manages one or more temporarily usable MAC addresses, which indicate a sender's address of a terminal, and corresponding time limits of each of the one or more temporarily usable MAC addresses respectively, and the wireless LAN connection control section is able to acquire the one or more temporarily usable MAC addresses, wherein the cellular phone network transmitter/receiver section acquires the one or more temporarily usable MAC addresses from a MAC address management server provided with a cellular phone network.