A frequency domain multiplexed signal receiving method which decodes received signals that are multiplexed in a frequency domain, the method comprising: a digital signal acquisition step of acquiring digital signals from the received signals that are multiplexed in the frequency domain; a branching step of branching the obtained digital signals to obtain frequency channel numbers of branched signal sequences for decoding; an equalization step of equalizing each of the branched signal sequences; and a decode step of decoding each of the equalized signal sequences, characterized by further comprising: an initial coefficient storage step of storing, using coefficients a k,0, a k,1,..., a k,n-1 of an n point discrete Fourier transform, coefficients [0, 0,..., 0, a k,0, a k,1,..., a k,n-1, 0, 0,...0] T, as initial weights of equalization weights w k = [w k,1, w k,2,..., W k,M] T with a tap number being M, which are used for a k th frequency channel among the branched signal sequences, wherein, the equalization step equalizes the branched signal sequence corresponding to the k th frequency channel using the coefficients stored in the initial coefficient storage step as the initial weights, using a formula: S k, i = ∑ n = 0 M − 1 w k, n + 1 X i + n − M in the formula, S k,,i denotes a transmitted signal estimated with respect to an i th dispersion time of the k th frequency channel, M denotes the tap number of the equalization weights, X i+n-M denotes a received signal at reception timing (i+n-M), and w k,i denotes an equalization coefficient of an equalization algorithm of the k th frequency channel. a digital signal acquisition step of acquiring digital signals from the received signals that are multiplexed in the frequency domain; a branching step of branching the obtained digital signals to obtain frequency channel numbers of branched signal sequences for decoding; an equalization step of equalizing each of the branched signal sequences; and a decode step of decoding each of the equalized signal sequences, characterized by further comprising: an initial coefficient storage step of storing, using coefficients a k,0, a k,1,..., a k,n-1 of an n point discrete Fourier transform, coefficients [0, 0,..., 0, a k,0, a k,1,..., a k,n-1, 0, 0,...0] T, as initial weights of equalization weights w k = [w k,1, w k,2,..., W k,M] T with a tap number being M, which are used for a k th frequency channel among the branched signal sequences, wherein, the equalization step equalizes the branched signal sequence corresponding to the k th frequency channel using the coefficients stored in the initial coefficient storage step as the initial weights, using a formula: S k, i = ∑ n = 0 M − 1 w k, n + 1 X i + n − M in the formula, S k,,i denotes a transmitted signal estimated with respect to an i th dispersion time of the k th frequency channel, M denotes the tap number of the equalization weights, X i+n-M denotes a received signal at reception timing (i+n-M), and w k,i denotes an equalization coefficient of an equalization algorithm of the k th frequency channel. an initial coefficient storage step of storing, using coefficients a k,0, a k,1,..., a k,n-1 of an n point discrete Fourier transform, coefficients [0, 0,..., 0, a k,0, a k,1,..., a k,n-1, 0, 0,...0] T, as initial weights of equalization weights w k = [w k,1, w k,2,..., W k,M] T with a tap number being M, which are used for a k th frequency channel among the branched signal sequences, wherein, the equalization step equalizes the branched signal sequence corresponding to the k th frequency channel using the coefficients stored in the initial coefficient storage step as the initial weights, using a formula: S k, i = ∑ n = 0 M − 1 w k, n + 1 X i + n − M in the formula, S k,,i denotes a transmitted signal estimated with respect to an i th dispersion time of the k th frequency channel, M denotes the tap number of the equalization weights, X i+n-M denotes a received signal at reception timing (i+n-M), and w k,i denotes an equalization coefficient of an equalization algorithm of the k th frequency channel.