A reception AGC circuit includes a high-speed power calculating circuit for calculating the power of an input signal at a short period, a normal power calculating circuit for calculating the power at a normal period, a circuit for receiving a power calculation result from the high-speed power calculating circuit or normal power calculating circuit to calculate a feedback amplification value, and addition amplification value setting units for self-station communication and peripheral station monitoring which receive the feedback amplification value through a switch and add the feedback amplification value to an amplifier in use. The high-speed power calculating circuit is switched to the normal power calculating circuit in accordance with the value of the difference between the power calculation result obtained by the high-speed power calculating circuit and a predetermined target reception power, and the addition amplification value setting units for self-station communication and peripheral station monitoring are selectively switched depending on whether communication with an external device is self-station communication or peripheral station monitoring.