A system that comprises a transmission apparatus and a reception apparatus and that is configured to use one or plural component carriers, wherein the transmission apparatus is a terminal and comprises: a generator configured to generate one or more sequences, a mapper configured to map each of the generated sequences to a resource in each of the component carriers, each as a reference signal, the resource in each of the component carriers being comprised of two sets of consecutive-frequency resources, and the two sets being inconsecutive in a frequency domain; and a transmitter configured to transmit the reference signal to the reception apparatus; and the reception apparatus is a base station and comprises: an allocation unit configured to allocate the resource in each of the component carriers to the transmission apparatus and output a resource allocation information, including the number of component carriers, a frequency position and a bandwidth of each component carrier to a demapper, wherein the resource allocation information is reported to the transmission apparatus in advance, a receiver configured to receive the reference signal transmitted by the transmitter, and a demapper configured to extract the reference signal from the received signal according to the resource allocation information received from the allocation unit; characterized in that, when one component carrier is configured, one sequence is generated and the generated sequence is mapped on the resource comprised of the two sets of consecutive-frequency resources in one component carrier by dividing the generated sequence into two sub sequences to match the two sets of consecutive-frequency resources, and, when plural component carriers are configured, plural sequences are generated and the generated sequences are respectively mapped to plural resources, each being comprised of the two sets of consecutive-frequency resources, in plural component carriers by adjusting each of the plural sequences to the respective one of the plural resources and by dividing each of the plural sequences into two sub sequences to match the two sets of consecutive-frequency resources in the respective one of the plural resources. the transmission apparatus is a terminal and comprises: a generator configured to generate one or more sequences, a mapper configured to map each of the generated sequences to a resource in each of the component carriers, each as a reference signal, the resource in each of the component carriers being comprised of two sets of consecutive-frequency resources, and the two sets being inconsecutive in a frequency domain; and a transmitter configured to transmit the reference signal to the reception apparatus; and a generator configured to generate one or more sequences, a mapper configured to map each of the generated sequences to a resource in each of the component carriers, each as a reference signal, the resource in each of the component carriers being comprised of two sets of consecutive-frequency resources, and the two sets being inconsecutive in a frequency domain; and a transmitter configured to transmit the reference signal to the reception apparatus; and the reception apparatus is a base station and comprises: an allocation unit configured to allocate the resource in each of the component carriers to the transmission apparatus and output a resource allocation information, including the number of component carriers, a frequency position and a bandwidth of each component carrier to a demapper, wherein the resource allocation information is reported to the transmission apparatus in advance, a receiver configured to receive the reference signal transmitted by the transmitter, and a demapper configured to extract the reference signal from the received signal according to the resource allocation information received from the allocation unit; an allocation unit configured to allocate the resource in each of the component carriers to the transmission apparatus and output a resource allocation information, including the number of component carriers, a frequency position and a bandwidth of each component carrier to a demapper, wherein the resource allocation information is reported to the transmission apparatus in advance, a receiver configured to receive the reference signal transmitted by the transmitter, and a demapper configured to extract the reference signal from the received signal according to the resource allocation information received from the allocation unit; characterized in that, when one component carrier is configured, one sequence is generated and the generated sequence is mapped on the resource comprised of the two sets of consecutive-frequency resources in one component carrier by dividing the generated sequence into two sub sequences to match the two sets of consecutive-frequency resources, and, when plural component carriers are configured, plural sequences are generated and the generated sequences are respectively mapped to plural resources, each being comprised of the two sets of consecutive-frequency resources, in plural component carriers by adjusting each of the plural sequences to the respective one of the plural resources and by dividing each of the plural sequences into two sub sequences to match the two sets of consecutive-frequency resources in the respective one of the plural resources.