A mobile station apparatus transmits capability information including at least indicator selected from a plurality of indicators that each define at least a combination of first information associated with an aggregated frequency bandwidth of one or more component carriers and second information associated with the quantity of component carriers included in the one or more component carriers. A base station apparatus includes a controller that allocates to a mobile station apparatus one or a plurality of component carriers to be used for communication based on a radio resource control (RRC) message received from the mobile station apparatus. The RRC message includes mobile station apparatus capability information including at least one indicator selected from the plurality of indicators.