The 1.times. wireless processing section communicates with the 1.times. base station while the EV-DO wireless processing section performs processing for communicating with the EV-DO base station. The measurement section measures strength of signals received from a plurality of base stations including the EV-DO base station performing data communication. The decision section decides whether or not the hand-off is to be performed based on the strength of the received signals measured by the measurement section. The reporting section generates a signal serving as a trigger for starting the hand-off in the case where the decision section decided to perform the hand-off and then outputs the signal to the EV-DO base station through the EV-DO processing section.