Disclosed is a technology that enables a user to quickly obtain associated information of a music piece to his/her taste while passively hearing music pieces. An initial screen is displayed. A box is displayed at the center of the initial screen, and a character string ‘FAVORITE MUSIC PIECE!’ is displayed in the box. Next, extracted part of a music piece is randomly selected and played back. Accordingly, a player can passively hear different music pieces in sequence. While part of a music piece is played back, when being satisfied with the music piece, a player touches ‘FAVORITE MUSIC PIECE!’ with a touch pen. If so, then a detail screen display processing is executed. During the detail screen display processing, the explanation including ‘COMPOSER’, ‘TITLE’, and ‘PLAYING FORM’ of the music piece is displayed.