Communications apparatus and communications system using multicarrier transmission mode

1. A base station accommodated in a communications system for communicating with a mobile station, the base station comprising:

a transmitter configured to generate frequency band information indicating which frequency band of frequency bands used in the communications system to communicate with a mobile station, to transmit the frequency band information by using a specific frequency band selected from a plurality of frequency bands available in the communications system, and to communicate with the mobile station using at least one of the plurality of frequency bands.

2. The base station as set forth in claim 1 , wherein,

at least one of information of a frequency band identification number and used/not used state, as at least one frequency band, is transmitted to the mobile station, for each of said frequency bands.

3. The base station as set forth in claim 1 , wherein the frequency bands except for the specific frequency band, are made variable.

4. A mobile station accommodated in a communications system for communicating with a base station, the mobile station comprising:

a receiver configured to receive frequency band information indicating which frequency of frequency bands used in the communications system to communicate with the base station, using a specific frequency band selected from a plurality of frequency bands available in the communications system, and to receive information by one or more frequency bands based on the frequency band information.

5. The mobile station as set forth in claim 4 , wherein,

at least one of information of a frequency band identification number and used/not used state, as at least one frequency band, is received from the base station, for each of said frequency bands.

6. The mobile station as set forth in claim 5 , wherein, said at least one frequency band is set from the frequency bands except for the specific frequency band.