using a dc offset value for a few immediately preceding slots allows dc offset elimination processing without time lags thus the present embodiment adds up and averages dc subcarrier signals to calculate a dc offset and eliminates this dc offset from the dc subcarrier signals which improves the reception quality of important information the ofdm transmission reception apparatus according to the present embodiment has the same configuration as that of the ofdm transmission reception apparatus according to embodiment 5 except that important information carried by the dc subcarrier and important information carried by the second subcarrier are combined embodiments 1 through 5 describe embodiments that select the dc subcarrier or second subcarrier whichever has a better reception condition however taking account of the fact that the reception quality of the dc subcarrier is also improved by eliminating dc offsets the present embodiment combines both to obtain important information the ofdm transmission reception apparatus according to the present embodiment is explained with reference to fig1 fig1 is a block diagram showing a configuration of a reception system of the ofdm transmission reception apparatus according to embodiment 6 of the present invention the parts in fig1 with the same configuration as that of embodiment 1 are assigned the same codes and their detailed explanations are omitted the block diagram of the transmission system is omitted the present embodiment also uses the second subcarrier as the subcarrier other than the dc subcarrier to carry.