A terminal device that uses a first serving cell group including a primary cell has a higher layer control information acquisition unit that configures a second serving cell group not including the primary cell, a channel state information generation unit that calculates respective pieces of periodic channel state information of serving cells, an uplink control information generation unit that generates uplink control information by dropping reports of the periodic channel state information other than one thereof in a case where the reports of plural serving cells in the first serving cell group collide with each other in one subframe and by dropping the reports of the periodic channel state information other than one thereof in a case where the reports of plural serving cells in the second serving cell group collide with each other in one subframe, and an uplink control information transmission unit that transmits an uplink subframe including the uplink control information. The channel state information is thereby efficiently shared regardless of a backhaul speed.