PURPOSE: To downsize a control circuit which puts signals, received by a main- side antenna and a subordinate-side antenna, together for a communication using a microwave transmitted with multiple carriers.

CONSTITUTION: In the reception system which puts multicarrier received signals together at a time after phase shift control, a frequency converting circuit 43 converts the frequencies of the received signals after the phase shift control and a phase difference detecting circuits 48 detects the phase difference of its output. The frequency converting circuit 43 is controlled by a switching control circuit 50 so as to extract phase differences of the respective multiple carriers in order. The output of the phase difference detecting circuit 48 is averaged by an averaging circuit 49 and the phase shift quantity of a phase shifter 13 is controlled by a phase shifter control circuit 51 so as to decrease the result of the averaging.