To provide a base station and a communication method, capable of providing an optimal communication environment in accordance with a communication status.

A base station A, which communicates with a plurality of mobile terminals B, is configured, to allocate a control channel (CCH) to a specific time slot by communicating with the mobile terminals B by using one or more carriers, when a time division multiple access system (TDD) is applied, and includes a control section for dynamically increasing/decreasing a ratio, to allocate the control channel to the time slot, according to the communication circumstance.