| 摘要 |
PURPOSE:To shorten the conversion time by attaining the storage and rewriting of image data and using the frequencies of said actions as elements. CONSTITUTION:When the source data is supplied to a retrieving means 1, a table 2 is retrieved to discriminate whether or not the image data corresponding to the source data is stored in an external memory such as a disk 4, etc. If the image data is stored, an image data means 3 is actuated to read out the image data and display it to a display part 5. If no image data is registered, the table 2 is referred to check the store area of the image data. Then the image data is produced when its store area exists. Thus the image data is written to the disk 4, and at the same time the code of the image data is registered. If no area exists for writing, the using frequency of the registered code is checked. Then the image data corresponding to the code having the minimum using frequency is erased and written to the disk 4. The source data of the image data, the using frequency and the control information are registered to the table 2.
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