1. An image display device that displays an image modulated by a light modulation device on an image display surface, comprising: an identification image selector that accepts an operation of selecting a displayed identification image corresponding to one of four sides of the image; a moving operator that accepts an operation of moving anode set at a predetermined position of the side corresponding to the identification image selected with the identification image selector; and a processor executing a program configured to: display the displayed identification image corresponding to one of four sides of the image; and correct a shape of the image by moving, based on the operation accepted with the moving operator, the node of the image displayed on an image display surface composed of a plurality of surfaces.