A transmission device comprising: a frequency scheduling unit adapted for a system where a system bandwidth is divided into a plurality of frequency blocks each comprising a plurality of consecutive frequency subcarriers and each of the frequency blocks is divided into multiple sub-blocks in a time domain, the frequency scheduling unit being configured to assign a downlink channel to a sub-block; and a mapping unit configured to map data of the downlink channel to the sub-block assigned by the frequency scheduling unit, wherein the frequency scheduling unit is adapted for the system where distributed type transmission for assigning the downlink channel of one user to multiple sub-blocks that are distributed across at least two of the frequency blocks and consecutive in the time domain and localized type transmission for assigning the downlink channel to a localized frequency block are defined, the frequency scheduling unit is configured to use either one of the distributed type transmission and the localized type transmission, characterized by: a control information generating unit configured to generate control information regarding the sub-blocks assigned by the frequency scheduling unit to the downlink channel; and a transmitting unit configured to transmit control information at a head part of the plurality of the frequency blocks, wherein the control information generating unit is configured to generate control information including information indicating whether the localized type transmission or the distributed type transmission is applied and consecutive-frequency-block allocation information indicating identification codes indicating locations of frequency blocks assigned to the distributed frequency blocks. a frequency scheduling unit adapted for a system where a system bandwidth is divided into a plurality of frequency blocks each comprising a plurality of consecutive frequency subcarriers and each of the frequency blocks is divided into multiple sub-blocks in a time domain, the frequency scheduling unit being configured to assign a downlink channel to a sub-block; and a mapping unit configured to map data of the downlink channel to the sub-block assigned by the frequency scheduling unit, wherein the frequency scheduling unit is adapted for the system where distributed type transmission for assigning the downlink channel of one user to multiple sub-blocks that are distributed across at least two of the frequency blocks and consecutive in the time domain and localized type transmission for assigning the downlink channel to a localized frequency block are defined, the frequency scheduling unit is configured to use either one of the distributed type transmission and the localized type transmission, a control information generating unit configured to generate control information regarding the sub-blocks assigned by the frequency scheduling unit to the downlink channel; and a transmitting unit configured to transmit control information at a head part of the plurality of the frequency blocks, wherein the control information generating unit is configured to generate control information including information indicating whether the localized type transmission or the distributed type transmission is applied and consecutive-frequency-block allocation information indicating identification codes indicating locations of frequency blocks assigned to the distributed frequency blocks.