Abstract: A musical tune playback apparatus is basically constituted by a controller (CPU), a digital media drive (e.g., a CD drive), a hard disk drive, and a sound system. Musical tune data recorded on a digital storage media (e.g., CD) are played back and are transferred to the hard disk drive together with relative information and/or image data. When a user inputs retrieval conditions, the controller retrieves musical tune data related to relative information (or image), which substantially matches retrieval conditions. Specifically, a relative information retrieval database is stored in a data area of the hard disk drive, wherein an auto-input area automatically describes an index ID, TOC information, and history information while a manual-input area describes other data and information with regard to each musical tune that is played back. Thus, desired musical tune data are automatically retrieved from the hard disk drive with reference to the database.