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