An image signal processing apparatus includes a receiving unit that receives a display signal including an image signal containing both two-dimensional and three-dimensional images and a region information in each predetermined unit in the image signal and separates the image signal and the region information from the display signal, a display control unit that generates a first display control information for controlling rendering positions of the first and second regions in the image signal according to the region information and a second display control information for selectively displaying a three-dimensional image in a region corresponding to the rendering position of the second region based on the region information, and a processing unit that generates a display image signal indicating an image where the first and second region are arranged according to the first display control information based on the image signal and the first display control information.