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, {HEAD ~ a read region} for {TAIL ~ the image data} read operation is set to be greater than the partial data region obtained by the subdivision of the image 
for
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 , { HEAD ~ a read region } for { TAIL ~ the image data } read operation is set to be greater than the partial data region obtained by the subdivision of the image
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