Audio player, having many items of music content stored therein and having at least a function for reproducing any one of the items of music content stored therein, is instructed to select and reproduce music content, corresponding to a user-designated music piece, from among the items of music content. In response to user's designation of the music piece, the audio player selects, from among the many items of music content, music content corresponding to the designated music piece and reproduces the selected music content. With such arrangements, a user is allowed to appropriately and readily set a performance environment suited for the desired music piece, by using the audio player to actually listen to and check the content of the music piece for which a performance environment is to be set.