<p>In a data transfer method, at the time of handing over a mobile station, a base station from which the mobile station is to be handed over transfers user data stored in a buffer for the mobile station to a base station to which the mobile station is to be handed over. The method is provided with a transfer order determining step wherein the base station from which the mobile station is to be handed over determines the transfer order of the user data, and a transfer step wherein such base station transfers the user data to the base station to which the mobile station is to be handed over, based on the transfer order.</p>
