1. An image display apparatus comprising: a storage configured to store an object image, associated with information on a shooting direction, and a spherical image, associated with directional information; a mask region extraction unit configured to extract a region that is to be masked in the object image; a mask processing unit configured to generate the object image where the region to be masked in the object image is masked; a positioning unit configured to adjust the directional information of the spherical image to be the shooting direction of the object image; a mapping processing unit configured to position the spherical image and then configured to map the mask-processed object image and the spherical image onto a three-dimensional (3D) object space as a texture; a three-dimensional (3D) image generator configured to generate a three-dimensional (3D) object image, when the 3D object image mapped by the mapping processing unit is viewed in a specified line of sight in such a manner so as to regard a shooting location of the object image as a viewpoint position; and a display control unit configured to display the 3D object image on a screen.