A terminal comprising: a receiving section adapted to receive downlink control information for each of a plurality of downlink component carriers, the downlink control information being received via one of a first downlink control channel transmitted by one or a plurality of control channel elements on a downlink control channel region and a second downlink control channel different from the first downlink control channel, the second downlink control channel being received on a downlink data channel region, and wherein the receiving section is further adapted to receive data on each of the plurality of downlink component carriers, the data being received via a data channel; a generation section adapted to generate response signals for the data in accordance with a pattern of the presence or absence of reception errors in the data on the respective downlink component carriers; and a control section adapted to control transmission of the response signals by selecting a resource of an uplink control channel in accordance with the pattern, the resource being used for the transmission of the response signals, characterized in that the control section is further adapted: to select the resource from a plurality of resources including a first resource associated with the control channel elements in the downlink control channel region and a second resource previously and explicitly notified by a base station, when the downlink control information is received via the first downlink control channel on a primary component carrier among the plurality of downlink component carriers, and to select the resource from a plurality of resources previously and explicitly notified by the base station including the second resource, when the downlink control information is received via the second downlink control channel on a primary component carrier among the plurality of downlink component carriers. a receiving section adapted to receive downlink control information for each of a plurality of downlink component carriers, the downlink control information being received via one of a first downlink control channel transmitted by one or a plurality of control channel elements on a downlink control channel region and a second downlink control channel different from the first downlink control channel, the second downlink control channel being received on a downlink data channel region, and wherein the receiving section is further adapted to receive data on each of the plurality of downlink component carriers, the data being received via a data channel; a generation section adapted to generate response signals for the data in accordance with a pattern of the presence or absence of reception errors in the data on the respective downlink component carriers; and a control section adapted to control transmission of the response signals by selecting a resource of an uplink control channel in accordance with the pattern, the resource being used for the transmission of the response signals, to select the resource from a plurality of resources including a first resource associated with the control channel elements in the downlink control channel region and a second resource previously and explicitly notified by a base station, when the downlink control information is received via the first downlink control channel on a primary component carrier among the plurality of downlink component carriers, and to select the resource from a plurality of resources previously and explicitly notified by the base station including the second resource, when the downlink control information is received via the second downlink control channel on a primary component carrier among the plurality of downlink component carriers.