1. A playback apparatus for playing back data from a semiconductor memory card, wherein: the semiconductor memory card contains: an audio sequence including a plurality of audio objects; a plurality of still image objects; at least one piece of playback route information which indicates an order in which audio objects, out of the plurality of audio objects in the audio sequence, are to be played back; at least one piece of first pointer information, wherein each of the at least one piece of first pointer information corresponds to a piece of the playback route information and specifies at least one still image object to be displayed when the audio objects in the order indicated by the corresponding piece of playback route information is played back; and at least one piece of second pointer information, wherein each of the at least one piece of second pointer information corresponds to an audio object in the audio sequence and specifies at least one still image object that should be displayed during playback of the corresponding audio object; said playback apparatus comprises: a playback unit operable to play back audio objects in the audio sequence one at a time in the order indicated by the corresponding piece of playback route information; a display unit operable to display the at least one still image object specified by the at least one piece of first pointer information throughout playback of the audio objects in the audio sequence; and a control unit operable to cause said display unit to display the at least one still image object specified by the at least one piece of second pointer information throughout playback of a particular audio object corresponding to the at least one piece of second pointer information.