1. A three-dimensional image displaying apparatus comprising: a non-removal storage unit having pre-stored parallax amount information for varying parallax between or among two-dimensional viewpoint images corresponding respectively to right and left eyes of one or more users to display a three-dimensional image to be perceived by the one or more users, the parallax amount information varying depending on respective locations within the three-dimensional image, the parallax amount information, when applied to the two-dimensional viewpoint images, differentiating a three-dimensional effect between or among the respective locations within the three-dimensional image; and an output unit configured to output the three-dimensional image in accordance with the parallax amount information.