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