In the first embodiment according to the present invention, for example, to correspond the partial region in the original image specified by the user to a position of the particular region of the compressed image data to be read from the file medium, the original image is subdivided into {HEAD ~ a plurality} of {TAIL ~ subregions} in advance and the recording position of the compressed data associated with each subregion is stored in an index record when the image data is registered to a file 
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In the first embodiment according to the present invention , for example , to correspond the partial region in the original image specified by the user to a position of the particular region of the compressed image data to be read from the file medium , the original image is subdivided into { HEAD ~ a plurality } of { TAIL ~ subregions } in advance and the recording position of the compressed data associated with each subregion is stored in an index record when the image data is registered to a file
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