Since the reproduced image of the partial data area thus attained may possibly be shifted from the subregion requested by the user, in the embodiment of the present invention, a read region for the image data read operation is set to be greater than {HEAD ~ the partial data region} obtained by {TAIL ~ the subdivision} of the image 
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Since the reproduced image of the partial data area thus attained may possibly be shifted from the subregion requested by the user , in the embodiment of the present invention , a read region for the image data read operation is set to be greater than { HEAD ~ the partial data region } obtained by { TAIL ~ the subdivision } of the image
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