To more accurately generate a virtual waveform of channel estimate values outside a bandwidth upon their interpolation in OFDM system while preventing the circuit size from increasing, a converter (104) performs a linear interpolation between channel estimate values corresponding to reference signals arranged at both ends of a predetermined bandwidth among first channel estimate values estimated based on reference signals, thereby estimating second channel estimate values corresponding to subcarriers outside the bandwidth. The converter (104) performs an inverse-FFT operation for channel estimate values obtained by merging the first and second channel estimate values to obtain a first delay profile, replaces with zero data components delayed for a predetermined threshold time or more in the first delay profile, performs an FFT operation for a delay profile obtained by the replacement to obtain third channel estimate values, and extracts therefrom channel estimate values corresponding to the subcarriers outside the bandwidth.