a receiver which allows suitable setting of the position of an fft window when executing fft to demodulate an ofdm signal . the receiver estimates the transmission path property of a received ofdm signal and estimates an isi amount in each case of a plurality of fft window position candidates from the estimated transmission path property . an fft window position candidate wherein the isi amount is estimated to be the smallest among the fft window position candidates is set as an actual fft window position , and executes fourier transformation .