A Doppler frequency calculating apparatus that calculates a Doppler frequency, which is the magnitude of a time-dependent fluctuation of the characteristic of the transmission path through which an orthogonal frequency-division multiplexing (OFDM) signal is transmitted, the apparatus comprising: received signal point memory means storing the received signal point of the sub-carrier having a reference carrier signal of the OFDM signal; modulated component eliminating means eliminating the modulated component from the received signal point stored in the received signal point memory means; and maximum Doppler frequency calculating means calculating a maximum Doppler frequency by performing frequency analysis on the received signal point of each sub-carrier from which the modulated component has been eliminated by the modulated component eliminating means, wherein the frequency analysis comprises: converting the received signal point for each sub-carrier from which the modulated component has been eliminated into an amplitude; calculating a maximum Doppler frequency (fd) for each sub-carrier to be a maximum frequency beyond a threshold amplitude (Th); supplying a maximum value (fdmax) of said maximum Doppler frequencies, and error correction decoding means performing error correction decoding on transmission control information, wherein the maximum Doppler frequency calculating means raises the threshold amplitude (Th) when the error correction decoding fails, the raised threshold amplitude being larger than the threshold amplitude when the error correction decoding succeeds. received signal point memory means storing the received signal point of the sub-carrier having a reference carrier signal of the OFDM signal; modulated component eliminating means eliminating the modulated component from the received signal point stored in the received signal point memory means; and maximum Doppler frequency calculating means calculating a maximum Doppler frequency by performing frequency analysis on the received signal point of each sub-carrier from which the modulated component has been eliminated by the modulated component eliminating means, wherein the frequency analysis comprises: converting the received signal point for each sub-carrier from which the modulated component has been eliminated into an amplitude; calculating a maximum Doppler frequency (fd) for each sub-carrier to be a maximum frequency beyond a threshold amplitude (Th); supplying a maximum value (fdmax) of said maximum Doppler frequencies, and error correction decoding means performing error correction decoding on transmission control information, wherein the maximum Doppler frequency calculating means raises the threshold amplitude (Th) when the error correction decoding fails, the raised threshold amplitude being larger than the threshold amplitude when the error correction decoding succeeds. converting the received signal point for each sub-carrier from which the modulated component has been eliminated into an amplitude; calculating a maximum Doppler frequency (fd) for each sub-carrier to be a maximum frequency beyond a threshold amplitude (Th); supplying a maximum value (fdmax) of said maximum Doppler frequencies, and error correction decoding means performing error correction decoding on transmission control information, wherein the maximum Doppler frequency calculating means raises the threshold amplitude (Th) when the error correction decoding fails, the raised threshold amplitude being larger than the threshold amplitude when the error correction decoding succeeds.