An information processing apparatus comprising: demodulation FFT processing means for carrying out a Fast Fourier Transform, FFT, process on a signal extracted from a received Orthogonal Frequency Division Multiplexing, OFDM, signal by making use of a demodulation FFT window, in order to convert said extracted signal from a time-domain signal into a frequency-domain signal and for outputting said frequency-domain signal as demodulation data; control FFT processing means separate to the demodulation FFT processing means for carrying out a control FFT process on a control-related signal extracted from said received OFDM signal by making use of a control FFT window in order to convert said extracted signal from a time-domain signal into a frequency-domain signal and for outputting said frequency-domain signal as control data, the control FFT window having a start time shifted relative to a start time of the demodulation FFT window; transmission-line information estimation means for generating a transmission-line information estimation value by making use of a Scattered Pilot, SP, signal selected from said frequency-domain signal output by said demodulation FFT processing means; equalization means (108, 112) for equalizing said demodulation data and said control data by making use of said transmission-line information estimation value generated by said transmission-line information estimation means; reception-quality computation means (113-1, 113-2) for computing a reception quality of said demodulation data by making use of all or a part of said demodulation data as equalized by said equalization means, and for computing a reception quality of said control data by making use of all or a part of said control data as equalized by said equalization means; reception-quality comparison means for comparing said computed reception quality of said demodulation data with said computed reception quality of said control data; and FFT-window position control means for controlling said demodulation FFT window to be used by said demodulation FFT processing means and said control FFT window to be used by said control FFT processing means on the basis of a comparison result produced by said reception-quality comparison means. demodulation FFT processing means for carrying out a Fast Fourier Transform, FFT, process on a signal extracted from a received Orthogonal Frequency Division Multiplexing, OFDM, signal by making use of a demodulation FFT window, in order to convert said extracted signal from a time-domain signal into a frequency-domain signal and for outputting said frequency-domain signal as demodulation data; control FFT processing means separate to the demodulation FFT processing means for carrying out a control FFT process on a control-related signal extracted from said received OFDM signal by making use of a control FFT window in order to convert said extracted signal from a time-domain signal into a frequency-domain signal and for outputting said frequency-domain signal as control data, the control FFT window having a start time shifted relative to a start time of the demodulation FFT window; transmission-line information estimation means for generating a transmission-line information estimation value by making use of a Scattered Pilot, SP, signal selected from said frequency-domain signal output by said demodulation FFT processing means; equalization means (108, 112) for equalizing said demodulation data and said control data by making use of said transmission-line information estimation value generated by said transmission-line information estimation means; reception-quality computation means (113-1, 113-2) for computing a reception quality of said demodulation data by making use of all or a part of said demodulation data as equalized by said equalization means, and for computing a reception quality of said control data by making use of all or a part of said control data as equalized by said equalization means; reception-quality comparison means for comparing said computed reception quality of said demodulation data with said computed reception quality of said control data; and FFT-window position control means for controlling said demodulation FFT window to be used by said demodulation FFT processing means and said control FFT window to be used by said control FFT processing means on the basis of a comparison result produced by said reception-quality comparison means.