A base station for assigning a plurality of unit bands to single communication, comprising: an obtaining section adapted to obtain terminal capability information which is transmitted by a terminal in an initial access unit band and which indicates a communication-capable bandwidth of the terminal; and a control section adapted to: when the terminal can have the plurality of unit bands in the communication-capable bandwidth indicated by the obtained terminal capability information, assign a unit band group including a unit band adjacent to the initial access unit band in addition to the initial access unit band, to the terminal, wherein a synchronization signal being mapped around a center of each of the initial access unit band and the unit band adjacent to the initial access unit band; and transmit in the initial access unit band on a Physical Downlink Shared Channel, PDSCH, to the terminal, a first information and a second information, whereby the terminal is operative to perform communication simultaneously on the initial access unit band and the unit band adjacent to the initial access unit band, wherein the first information being information to instruct for a reference frequency in a communication band of the terminal to be moved to a reference frequency in the unit band group such that the unit band group is included in the communication band of the terminal, and the second information being information used to identify a control channel transmitted in the unit band group excluding the initial access unit band. an obtaining section adapted to obtain terminal capability information which is transmitted by a terminal in an initial access unit band and which indicates a communication-capable bandwidth of the terminal; and a control section adapted to: when the terminal can have the plurality of unit bands in the communication-capable bandwidth indicated by the obtained terminal capability information, assign a unit band group including a unit band adjacent to the initial access unit band in addition to the initial access unit band, to the terminal, wherein a synchronization signal being mapped around a center of each of the initial access unit band and the unit band adjacent to the initial access unit band; and transmit in the initial access unit band on a Physical Downlink Shared Channel, PDSCH, to the terminal, a first information and a second information, whereby the terminal is operative to perform communication simultaneously on the initial access unit band and the unit band adjacent to the initial access unit band, wherein the first information being information to instruct for a reference frequency in a communication band of the terminal to be moved to a reference frequency in the unit band group such that the unit band group is included in the communication band of the terminal, and the second information being information used to identify a control channel transmitted in the unit band group excluding the initial access unit band. when the terminal can have the plurality of unit bands in the communication-capable bandwidth indicated by the obtained terminal capability information, assign a unit band group including a unit band adjacent to the initial access unit band in addition to the initial access unit band, to the terminal, wherein a synchronization signal being mapped around a center of each of the initial access unit band and the unit band adjacent to the initial access unit band; and transmit in the initial access unit band on a Physical Downlink Shared Channel, PDSCH, to the terminal, a first information and a second information, whereby the terminal is operative to perform communication simultaneously on the initial access unit band and the unit band adjacent to the initial access unit band, wherein the first information being information to instruct for a reference frequency in a communication band of the terminal to be moved to a reference frequency in the unit band group such that the unit band group is included in the communication band of the terminal, and the second information being information used to identify a control channel transmitted in the unit band group excluding the initial access unit band.