Patent ID: 8010145

Claim:
A mobile communication terminal comprising: communication availability determination means which determines whether a second communication network is available, in accordance with movement of the mobile communication terminal from a communication area of a first base station constituting a first communication network to a communication area of a second base station constituting the second communication network which is different from the first communication network; communication means which performs transmission and reception to enable communications via at least the first communication network; and restriction means which controls the communication means to restrict communication that uses the first communication network, by controlling transmission power for communication to be reduced to a degree such that the first base station cannot receive a radio wave from the mobile communication terminal but reception by the mobile terminal from the first base station is maintained and the transmission power maintains the communication with the second communication network, when the communication availability determination means determines that the second communication network is available; wherein the restriction means, when the communication availability determination means determines that a status in which the second communication network is available is changed to a status at which the second communication network is unavailable, controls the transmission power for communication to recover to such a degree that the first base station can be communicated with, so that data transmission using the first communication network is enabled.