According to the present invention, based on positional information contained in an index record, a recording position of an image data on the file medium corresponding to {TAIL ~ a position} in an original image specified by the user for a display or to a partial area of a reproduced image is obtained so as to selectively read out only a data portion at a position corresponding to the partial region from each image record on the file medium, which minimizes {HEAD ~ the quantity} of image data to be read and hence reduces the image display cycle 
According to the present invention , based on positional information contained in an index record , a recording position of an image data on the file medium corresponding to { TAIL ~ a position } in an original image specified by the user for a display or to a partial area of a reproduced image is obtained so as to selectively read out only a data portion at a position corresponding to the partial region from each image record on the file medium , which minimizes { HEAD ~ the quantity } of image data to be read and hence reduces the image display cycle
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