1. An image display method comprising: representing at least one sub-image on at least one face, respectively, of a three-dimensional (3D) form; adding the 3D form on which the at least one sub-image is represented, to a main image; and displaying the main image to which the 3D form is added, on a display, wherein the at least one sub-image is displayed as a still image during rotation of the 3D form, and the at least one sub-image is displayed as a moving image before and after rotation of the 3D form.