To prevent overhead by a control signal from increasing excessively while improving frequency utilization efficiency, when using different frequency bands in the same region.

A radio communication device includes: an intermediate band detection section for detecting an intermediate band, namely the band between first and second frequency bands assigned to the same or a different mobile communication system; a use situation detection section for detecting a multiplex system of uplinks and downlinks used in the first and second frequency bands, respectively; and a decision section for at least deciding the multiplex system of the uplinks and downlinks usable in the intermediate band and a guard band prohibited in the intermediate band, based on the intermediate band and the multiplex system of uplinks and downlinks.