it is no the cpu 2010 moves to step s 234 in step s 233 the cpu 2010 sets a display mode and moves to step s 255 in step s 234 the cpu 2010 sets a display mode and moves to step s 235 in step s 235 the cpu 2010 determines whether an image is present within a viewing angle if the determination is yes the cpu 2010 moves to step s 243 if it is no the cpu 2010 moves to step s 236 in step s 236 the cpu 2010 determines whether to use an image in an adjacent area if the determination is yes the cpu 2010 moves to step s 237 if it is no the cpu 2010 moves to step s 244 in step s 237 the cpu 2010 selects an image in an adjacent area from the image database unit 1 via the network 10 and moves to step s 238 in step s 238 the cpu 2010 determines whether to explicitly describe that the image is from an adjacent area if the determination is yes the cpu 2010 moves to step s 239 if it is no the cpu 2010 moves to step s 245 in step s 239 the cpu 2010 displays the image while changing the brightness hue and chroma thereof according to the display mode and exits the process and returns to the image display process in step s 240 the cpu 2010 determines whether the display space includes another space if the determination is.