Wireless terminal and communication system switching method

A wireless terminal involving small redundancy that can be reconfigured to a configuration compatible with a plurality of systems using the hardware resources compatible with one system is provided. A wireless terminal 100A is compatible with an OFCDM system and has a signal processing section 151, a synchronous detection section 162, etc. The signal processing section 151 performs Fourier transform when the wireless terminal is compatible with the OFCDM system; the signal processing section 151 performs Fourier transform and inverse Fourier transform compatible with an OFDM system when the wireless terminal is compatible with the OFDM system and a CDMA system. When the wireless terminal is compatible with the OFCDM system, the synchronous detection section 162 uses taps used in the systems when the wireless terminal is compatible with the OFDM system and the CDMA system. When the wireless terminal 100A is placed out of the area in the OFCDM system, it is switched to a configuration compatible with the OFDM system and the CDMA system.