Demodulation circuit, a demodulation method and reception system,

A demodulating circuit includes: a fast Fourier transform circuit which fast Fourier transforms a received signal and outputs a plurality of carrier signals; an output selecting circuit which selects at least two signals from the plurality of carrier signals, the at least two signals including a first signal modulated in accordance with a first modulation method and a second signal modulated in accordance with a second modulation method; an inverse fast Fourier transform circuit which inverse Fourier transforms transmission path characteristic values including a first transmission path characteristic value obtained based on the first signal and a second transmission path characteristic value obtained based on the second signal; and an FFT window control circuit which controls a position of an FFT window based on the inverse Fourier transformed transmission path characteristic values.