An image-displaying device includes a first storage means, an image data generation means, a timing information acquisition means and a display control means. The image data generation means is configured to output the image data to the first storage means with the image data being composed of a plurality of predetermined data units. The timing information acquisition means is configured to acquire timing information indicative of a timing related to generation and output of the image data to the first storage means with respect to each of the predetermined data units. The display control means is configured to control a display means to read and display an N th one of the predetermined data units after output of an (N+i) th one of the predetermined data units to the first storage means is completed according to the timing information, where N is a natural number and i is a nonnegative integer.