By switching to a method that allocates frequency diversity as an independent signal sequence during the time when an influence of fading is small, adaptively corresponding to an increase and decrease of fading, performs stable wireless communication, and frequency resources are effectively utilized. A wireless communication system selects and performs quadruple diversity which is composed of space diversity using two uncorrelated antennas and frequency diversity using two waves of frequencies f1 and f2 or double diversity of only the space diversity. A matching filter 211 evaluates that the influence of fading is small when all tap information from adaptive matched filters 207 to 210 indicates a value greater than or equal to a threshold, and while switching selector switches 104 and 215 and performing only the space diversity, transmitting and receiving independent two transmission data that is respectively modulated by modulators 102 and 103.