A receiver employing an OFDM system which uses a frequency band that is constituted by a plurality of subchannels, and receiving a signal added a phase rotation which is made to respectively differ for each transmission antennas of transmitter and transmitted from the transmission antennas, having a virtual subchannel quality estimating portion which estimates the quality of a propagation path in the case of same phase rotation is added to signal transmitted from transmitter, each group configured with a plurality of consecutive subcarriers.