To provide an image processing apparatus that enables display of a situation where all or a part of a display image changes using simple image processing. A first texture image, a second texture image, display priority of each pixel constituting the first texture image and a threshold value of the display priority are stored in advance. The second texture image is drawn on a predetermined polygon (S205), and the first texture image is further drawn thereon in accordance with the result of comparison between the display priority and the threshold value (S206).