| 摘要 |
The expiration of a validity period of song data for each of a plurality of songs is determined by comparing validity period data of the song data, which are stored in a song data storage area 20 a for storing the song data including the validity period data, with the current time and date shown on a timer 30 , and expired song data are deleted. Further, song data which do not exist in the song data storage area 20 a are identified by comparing the storage content of the song data storage area 20 a with a data list transmitted from a server 80 , and a request is placed with the server 80 for distribution of these song data.
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