An image display device for displaying an image includes an image display unit that displays an image based on image data inputted from the outside, a superimposing unit that superimposes a pointer image which can be moved according to an instruction from the outside on the displayed image, a position receiving unit that receives designation of a moved position of the pointer image on the image and a highlighting unit that highlights an image in a given area which is determined based on a property of a pixel corresponding to the received moved position.