The mobile communication terminal includes a first unit which measures a SIR of a signal received from a base station, a second unit which determines a target SIR, and a third unit which compares the SIR measured by the first unit to the target SIR, and produces TPC data in accordance with the result of the comparison, the TPC data being used for controlling signal-transmission power by which the base station transmits a signal to the mobile communication terminal, the TPC data being transmitted to the base station together with a signal to be transmitted to the base station from the mobile communication terminal. The second unit lowers the target SIR if a signal for calling is not received from the base station by a predetermined period of time, and further if communication quality between the mobile communication terminal and the base station is equal to or greater than threshold quality.