A method of reporting a channel state for a plurality of bands includes transmitting channel quality indicators (CQIs) for the respective bands, and transmitting CQI variation information, wherein the CQI variation information comprises CQI up/down information indicating whether the CQIs of the respective bands collectively increase or decrease and a CQI variation indicating a collective variation of the CQIs of the respective bands. Accordingly, waste of resources consumed for the CQIs can be reduced.