A terminal is provided. The terminal communicates with a base station in a mobile communication system which supports carrier aggregation provided by a first cell and a second cell which uses a subframe whose time interval is shorter than a time interval of a subframe of the first cell. The terminal includes a calculation unit configured to calculate reporting information to be reported to the base station based on a specific subframe, of a plurality of subframes of the second cell corresponding to a predetermined subframe of the first cell, shared by the base station and the terminal; and a reporting unit configured to report the reporting information calculated by the calculation unit to the base station.