A reproduction list PL1 and specified BPMs of pieces of music that are to be used to control the operation of replaying the pieces of music are prepared on the basis of their ordinary BPMs that indicate the tempos specified in advance for the respective pieces of music (and hence the reproduction speeds specified in advance by the audio data of the respective pieces of music) so that it is now possible to prepare with ease a reproduction list PL1 for replaying only pieces of music having the same tempo or specified BPMs for changing the tempo of each of the pieces of music to a desired one, according to the tempo of a piece of music. Thus, it is also possible to replay with ease each of the pieces of music with a desired tempo (or a reproduction speed) according to the reproduction list PL1 and the specified BPMs.