A mobile terminal control program for automatically selecting an appropriate communication channel, depending on the remaining battery level. When mobile terminal equipment enters the service area of a wireless LAN, a wireless-LAN service area determination section obtains wireless-LAN radio strength from a call-via-wireless-LAN section. If the radio strength is not lower than a certain level, it is determined that the equipment has entered the service area. Then, a communication channel selection section obtains the remaining battery level from a battery management circuit, and selects a terminating communication channel in accordance with the remaining battery level. If the communication channel selection section selects a communication channel through the wireless LAN, a routing setup request section gives a channel-routing-setup management unit a routing setup request for routing an incoming call directed at a telephone number through the wireless telephone network to a communication channel through the wireless LAN.