A reception device for receiving an Orthogonal Frequency Division, OFDM, signal, comprising: a Fourier transform unit operable to perform Fourier transform on the received OFDM signal on a symbol-by-symbol basis in a designated Fast Fourier Transform, FFT, window position, so as to obtain a transformed signal; a channel characteristic estimation unit operable to estimate channel characteristics based on the transformed signal; and a window position control unit operable to estimate, based on the channel characteristics, a plurality of Inter Symbol Interference, ISI, amounts that are each an amount of ISI occurring if the Fourier transform is performed in a corresponding one of FFT window position candidates, and to designate, as the FFT window position, one of the plurality of FFT window position candidates that corresponds to a smallest estimated ISI amount, wherein the window position control unit includes: an ISI amount estimation unit operable to estimate the plurality of ISI amounts based on the channel characteristics; and a determination unit operable to determine the FFT window position candidate corresponding to the smallest estimated ISI amount, and designate the FFT window position candidate as the FFT window position characterized in that the ISI amount estimation unit includes: a computation unit operable to rotate a phase of the channel characteristics in accordance with each FFT window position candidate, so as to obtain rotated channel characteristics corresponding one-to-one to the FFT window position candidates; and a filter unit operable to estimate the plurality of ISI amounts by filtering the rotated channel characteristics. a Fourier transform unit operable to perform Fourier transform on the received OFDM signal on a symbol-by-symbol basis in a designated Fast Fourier Transform, FFT, window position, so as to obtain a transformed signal; a channel characteristic estimation unit operable to estimate channel characteristics based on the transformed signal; and a window position control unit operable to estimate, based on the channel characteristics, a plurality of Inter Symbol Interference, ISI, amounts that are each an amount of ISI occurring if the Fourier transform is performed in a corresponding one of FFT window position candidates, and to designate, as the FFT window position, one of the plurality of FFT window position candidates that corresponds to a smallest estimated ISI amount, wherein the window position control unit includes: an ISI amount estimation unit operable to estimate the plurality of ISI amounts based on the channel characteristics; and a determination unit operable to determine the FFT window position candidate corresponding to the smallest estimated ISI amount, and designate the FFT window position candidate as the FFT window position an ISI amount estimation unit operable to estimate the plurality of ISI amounts based on the channel characteristics; and a determination unit operable to determine the FFT window position candidate corresponding to the smallest estimated ISI amount, and designate the FFT window position candidate as the FFT window position characterized in that the ISI amount estimation unit includes: a computation unit operable to rotate a phase of the channel characteristics in accordance with each FFT window position candidate, so as to obtain rotated channel characteristics corresponding one-to-one to the FFT window position candidates; and a filter unit operable to estimate the plurality of ISI amounts by filtering the rotated channel characteristics. a computation unit operable to rotate a phase of the channel characteristics in accordance with each FFT window position candidate, so as to obtain rotated channel characteristics corresponding one-to-one to the FFT window position candidates; and a filter unit operable to estimate the plurality of ISI amounts by filtering the rotated channel characteristics.