1. An image displaying medium on which a single-frame composite image is displayed, comprising: an image displaying medium; and a single-frame composite image displayed on the image displaying medium, wherein the single-frame composite image includes a displaying image including mesh points having a first linearity and a latent image including mesh points having a second linearity, the latent image being embedded in the displaying image on the image displaying medium, wherein, when the first linearity and the second linearity are enlarged by an optical system, the mesh points having the first linearity generate a first moire pattern and the mesh points of the second linearity generate a second moire pattern, the second moire pattern being different from the first moire pattern, and wherein the optical system that enlarges the first linearity and the second linearity is a lenticular lens comprised of a plurality of cylindrical lenses having arcs smaller than a semicircle, the plurality of cylindrical lenses covering the single-frame composite image.