A disclosed transmission device includes a frequency scheduling unit configured to allocate, to each user, either frequency blocks that are consecutive frequency subcarrier blocks obtained by dividing a system bandwidth or distributed frequency blocks that are frequency subcarrier blocks discretely distributed in the system bandwidth; and a mapping unit configured to assign transmission data to the frequency blocks or the distributed frequency blocks according to the allocation result. The frequency scheduling unit is configured to allocate the distributed frequency blocks using the frequency blocks as units and to allocate sub-blocks obtained by dividing the respective distributed frequency blocks.