A radio communication apparatus (mobile station) in which analysis is performed on the transmission of data to an external apparatus. A mobile station transmitting the CQI information used for adaptive modulation control in the radio base station comprises a supervising unit operable to supervise a staying condition of data to be transmitted to an external apparatus, a CQI generating unit for generating the CQI information reflecting the result of a supervising process by the supervising unit, and a transmitting unit for transmitting the generated CQI information to the radio base station, and a mobile station for sending a re-transmission request reflecting the result of the supervising process.