A terminal configured with at least two downlink component carriers including a first downlink component carrier and a second downlink component carrier, the terminal comprising: a control information detecting section configured to detect first downlink assignment information indicating a resource for first downlink data, which is assigned to the first downlink component carrier, and detect second downlink assignment information indicating a resource for second downlink data, which is assigned to the second downlink component carrier; a decoding section configured to decode the first downlink data, which is transmitted from a base station in the resource indicated by the detected first downlink assignment information, and decode the second downlink data, which is transmitted from the base station in the resource indicated by the detected second downlink assignment information; and a transmission controlling section configured to transmit, to the base station, a first response signal for the decoded first downlink data and a second response signal for the decoded second downlink data and to transmit a scheduling request, SR, each of the first response signal and the second response signal denoting ACK or NACK as an outcome of the decoding or a DTX representing that the outcome is not transmitted, characterized in that: when the first response signal and the second response signal are transmitted, the first response signal and the second response signal are transmitted using a phase point of one of a first uplink control channel resource for response signal and a second uplink control channel resource for response signal, the first uplink control channel being associated with the first downlink assignment information and the second uplink control channel being associated with the second downlink assignment information, wherein the first uplink control channel resource is used when the second response signal denotes the DTX, and the second uplink control channel resource is used when the first response signal denotes the DTX; and when the first response signal, the second response signal and SR are transmitted in a same sub-frame, the first response signal, the second response signal and the SR are transmitted using one of phase points of a uplink control channel resource for SR, the phase points including a first phase point, a second phase point, a third phase point and the fourth phase point, wherein the first phase point is used when the first response signal denotes ACK and the second response signal denotes NACK or DTX, the second phase point is used when the first response signal denotes NACK or DTX and the second response signal denotes NACK or DTX, the third phase point is used when the first response signal denotes ACK and the second response signal denotes ACK, and the fourth phase point is used when the first response signal denotes NACK or DTX and the second response signal denotes ACK. a control information detecting section configured to detect first downlink assignment information indicating a resource for first downlink data, which is assigned to the first downlink component carrier, and detect second downlink assignment information indicating a resource for second downlink data, which is assigned to the second downlink component carrier; a decoding section configured to decode the first downlink data, which is transmitted from a base station in the resource indicated by the detected first downlink assignment information, and decode the second downlink data, which is transmitted from the base station in the resource indicated by the detected second downlink assignment information; and a transmission controlling section configured to transmit, to the base station, a first response signal for the decoded first downlink data and a second response signal for the decoded second downlink data and to transmit a scheduling request, SR, each of the first response signal and the second response signal denoting ACK or NACK as an outcome of the decoding or a DTX representing that the outcome is not transmitted, when the first response signal and the second response signal are transmitted, the first response signal and the second response signal are transmitted using a phase point of one of a first uplink control channel resource for response signal and a second uplink control channel resource for response signal, the first uplink control channel being associated with the first downlink assignment information and the second uplink control channel being associated with the second downlink assignment information, wherein the first uplink control channel resource is used when the second response signal denotes the DTX, and the second uplink control channel resource is used when the first response signal denotes the DTX; and when the first response signal, the second response signal and SR are transmitted in a same sub-frame, the first response signal, the second response signal and the SR are transmitted using one of phase points of a uplink control channel resource for SR, the phase points including a first phase point, a second phase point, a third phase point and the fourth phase point, wherein the first phase point is used when the first response signal denotes ACK and the second response signal denotes NACK or DTX, the second phase point is used when the first response signal denotes NACK or DTX and the second response signal denotes NACK or DTX, the third phase point is used when the first response signal denotes ACK and the second response signal denotes ACK, and the fourth phase point is used when the first response signal denotes NACK or DTX and the second response signal denotes ACK.