A playback system for playing back image data from a recording medium on which image data of a plurality of titles is recorded and for outputting the played-back image data to an external display device while an image related to the played-back image data is being displayed on a display section. In response to an instruction for displaying a representative image list of the plurality of titles, the representative image list is displayed on the display section while the played-back image data is being output to an external display device.