| 摘要 |
PURPOSE:To preserve efficiently information by classifying preliminarily information, which is stored in an erasable storage device, into erase inhibit information and erase permission information and erasing automatically erase permission information when prescribed conditions are satisfied. CONSTITUTION:Digitized image information inputted from an image input device 1 through a control part 7 consisting of a computer system is stored in an electronic file device 2 consisting of an erasable storage device, for example, a photomagnetic disc or the like where digitized picture information D2, etc. are stored, and reproduced picture information is outputted from the device 2 to a display device 3 or a printer 4 in accordance with the request of an operator. The keyword, the generation date, the frequency in retrieval, etc. of image information stored in the electronic file device 2 are stored in an external storage device 6 consisting of a normal magnetic disc or the like, and data whose frequency in retrieval is '0' through the validity time expires is erased automatically.
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