A base station apparatus comprising: an allocating unit configured to allocate a virtual resource block with a first allocation or a second allocation to a mobile station, wherein the virtual resource block is set for a part of a plurality of physical resource blocks (1, 2,...24), into which a plurality of subcarriers are divided and each of said physical resource blocks is comprised of a plurality of subcarriers that are consecutive in the frequency domain; and a transmitting unit configured to transmit, to the mobile station, control information including both information distinguishing between the first allocation and the second allocation and information indicating the allocated virtual resource block, wherein: the plurality of physical resource blocks are divided into a plurality of groups (1-1, 1-2, 2-1, 2-2), each of the groups being comprised of a predetermined number of physical resource blocks that are consecutive in the frequency domain; in the first allocation, a subband is formed by at least two groups of the plurality of groups that are inconsecutive in the frequency domain, and the subband comprises physical resource blocks partially extracted from the plurality of physical resource blocks of said at least two groups, and the virtual resource block is set for said physical resource blocks forming the subband and is allocated to the mobile station; in the second allocation, the virtual resource block is set for physical resource blocks, which are consecutive in the frequency domain and for which the virtual resource block in the first allocation is not set, and is allocated to the mobile station; and the information indicating the allocated virtual resource block in the control information has the same number of bits in the first allocation and the second allocation. an allocating unit configured to allocate a virtual resource block with a first allocation or a second allocation to a mobile station, wherein the virtual resource block is set for a part of a plurality of physical resource blocks (1, 2,...24), into which a plurality of subcarriers are divided and each of said physical resource blocks is comprised of a plurality of subcarriers that are consecutive in the frequency domain; and a transmitting unit configured to transmit, to the mobile station, control information including both information distinguishing between the first allocation and the second allocation and information indicating the allocated virtual resource block, wherein: the plurality of physical resource blocks are divided into a plurality of groups (1-1, 1-2, 2-1, 2-2), each of the groups being comprised of a predetermined number of physical resource blocks that are consecutive in the frequency domain; in the first allocation, a subband is formed by at least two groups of the plurality of groups that are inconsecutive in the frequency domain, and the subband comprises physical resource blocks partially extracted from the plurality of physical resource blocks of said at least two groups, and the virtual resource block is set for said physical resource blocks forming the subband and is allocated to the mobile station; in the second allocation, the virtual resource block is set for physical resource blocks, which are consecutive in the frequency domain and for which the virtual resource block in the first allocation is not set, and is allocated to the mobile station; and the information indicating the allocated virtual resource block in the control information has the same number of bits in the first allocation and the second allocation. the plurality of physical resource blocks are divided into a plurality of groups (1-1, 1-2, 2-1, 2-2), each of the groups being comprised of a predetermined number of physical resource blocks that are consecutive in the frequency domain; in the first allocation, a subband is formed by at least two groups of the plurality of groups that are inconsecutive in the frequency domain, and the subband comprises physical resource blocks partially extracted from the plurality of physical resource blocks of said at least two groups, and the virtual resource block is set for said physical resource blocks forming the subband and is allocated to the mobile station; in the second allocation, the virtual resource block is set for physical resource blocks, which are consecutive in the frequency domain and for which the virtual resource block in the first allocation is not set, and is allocated to the mobile station; and the information indicating the allocated virtual resource block in the control information has the same number of bits in the first allocation and the second allocation.