A music piece managing unit judges whether or not a music piece file name corresponding to a music piece ID received from a playing processing unit exists in a corresponding music piece file storing unit, and in the event that judgment is made that the file name does not exist, a drive letter in the obtained file name is changed to the drive letter of a currently-connected drive, thereby generating a new file name. The music piece managing unit then judges whether or not the newly-generated file name exists in the corresponding music piece file storing unit, and in the event that judgment is made that the file name exists, the file name of the music piece is updated to the newly-generated file name. Thus, music piece files can be readily searched for, even in the event that the configuration of the drives has been changed.