Radio frequency signals are transmission-receiving processed by N antennas. A radio unit performs a frequency translation processing, an amplification processing and an A-D or D-A conversion processing between a baseband signal and the radio frequency signal. A signal processing unit performs a signal processing necessary for the transmission/receiving processing by adaptive antennas. A modem unit performs modulation/demodulation processings. A baseband unit serves as interface with a network. A storage period deciding unit determines storage period for a received response vector estimated by the signal processing unit. A control unit controls timings and the like of the radio unit, the signal processing unit, the modem unit and the baseband unit.