1. An image special effect apparatus for adding, to image information concerning an input image, an illumination effect using light from a light source when viewed from an arbitrary eye point in a face having a curved face, and outputting a video signal provided by mapping the image information to the face, the image special effect apparatus comprising: a normal vector generation section for generating a normal vector indicating a vector in a normal direction at a position of the face based on rectangular coordinate data indicating the positions of a horizontal coordinate and a vertical coordinate of the face and the shape of the face; an illumination effect generation section for generating reflectivity of the light in a direction of the eye point by calculation of A (2(L·N)N−2L)·V of an expression using the normal vector, a light source direction unit vector indicating a unit vector in a direction of the light source, an eye point vector V indicating a vector in the eye point direction, and an arbitrary value A; and an image information creation section for creating the image information based on the image and the reflectivity.