A terminal apparatus comprising: an extraction section configured to receive downlink data on a first component carrier and a second component carrier, wherein a first Uplink/Downlink, UL/DL, configuration pattern is set to the first component carrier and a second UL/DL configuration pattern which is different from the first configuration pattern is set to the second component carrier, and wherein each of the first UL/DL configuration pattern and the second UL/DL configuration pattern is one of a plurality of UL/DL configuration patterns for a frame including a plurality of uplink subframes and a plurality of downlink subframes; a CRC section configured to perform error detection of the downlink data received using the second component carrier and a response signal generating section to generate a response signal indicating error detection results for each downlink subframe of a plurality of downlink subframes on the second component carrier; and a control section configured to transmit the response signal for the each downlink subframe on the second component carrier using a specified uplink subframe in a frame on the first component carrier, wherein the plurality of UL/DL configuration patterns include two UL/DL configuration patterns whose periodicity of a switching point from downlink transmission to uplink transmission, DL/UL switching point, in the frame is different from each other, and wherein the specified uplink subframe is an uplink subframe common to a plurality of UL/DL configuration patterns with a same periodicity of the DL/UL switching point, wherein the specified uplink subframe is an uplink subframe located at an earliest timing which is more than four subframes after the each downlink subframe. an extraction section configured to receive downlink data on a first component carrier and a second component carrier, wherein a first Uplink/Downlink, UL/DL, configuration pattern is set to the first component carrier and a second UL/DL configuration pattern which is different from the first configuration pattern is set to the second component carrier, and wherein each of the first UL/DL configuration pattern and the second UL/DL configuration pattern is one of a plurality of UL/DL configuration patterns for a frame including a plurality of uplink subframes and a plurality of downlink subframes; a CRC section configured to perform error detection of the downlink data received using the second component carrier and a response signal generating section to generate a response signal indicating error detection results for each downlink subframe of a plurality of downlink subframes on the second component carrier; and a control section configured to transmit the response signal for the each downlink subframe on the second component carrier using a specified uplink subframe in a frame on the first component carrier, wherein the plurality of UL/DL configuration patterns include two UL/DL configuration patterns whose periodicity of a switching point from downlink transmission to uplink transmission, DL/UL switching point, in the frame is different from each other, and wherein the specified uplink subframe is an uplink subframe common to a plurality of UL/DL configuration patterns with a same periodicity of the DL/UL switching point, wherein the specified uplink subframe is an uplink subframe located at an earliest timing which is more than four subframes after the each downlink subframe. <EOS>