To provide an image display system which uses a flexible display device called electronic paper, is adaptive to various printing forms and printing inks, and can freely generate a proof approximated to printed matter obtained by using them for simulation.

The image display system using the flexible display device displaying an image by combining a plurality element colors is equipped with a printing condition table storing a plurality of printing conditions of target printed matter and a plurality of look-up tables wherein printing colors determined by the printing conditions and element colors for coloration of the display device approximated to the respective printing colors are related to each other, and enable the display device to display a plurality of images differing in picture quality as printing conditions are selected.