Importance

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Abstract

A material storage unit copies materials to supply buffer units corresponding to a play list. The supply buffer units designate use frequency levels to individually copied materials. The use frequency levels are automatically updated corresponding to the number of times the relevant materials have been supplied. When materials are supplied from the supply buffer units, the relevant supply date/time is stored. When the material storage unit copies material to the supply buffer units, if they do not have blank areas, unnecessary materials are deleted therefrom. At this point, a material whose use frequency level is the lowest and that is not designated in a play list is deleted. When all materials are designated in a play list, a material whose supply date/time is the oldest and whose use frequency level is the lowest is deleted. In addition, a material whose use frequency level is for example '5' is not deleted.

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First Claim