There are included a plurality of mapping units to which a plurality of data signal sequences related to the same data signal sequence are input via spectra cyclic shift units and which arrange the input data signal sequences on the frequency axis and output the arranged data signal sequences as transmission frequency spectra; an assignment information acquisition unit that controls the plurality of mapping units based on assignment information to cause the data signal sequences arranged on the frequency axis to partially overlap; the spectra cyclic shift units shifting, under control of an amount-of-shift decision unit, the input data signal sequences by an amount of cyclic shift to cause partially overlapping data signals to be identical and outputting the data signal sequences; and a plurality of transmit antennas that send out the transmission frequency spectra output by the plurality of mapping units.