The case in which the determination in step S121 is NO is a case in which the cover unit 2 is merely opened from the state of FIG. 24A and rotated with the first hinge 100 being as a shaft (step S109; YES), and the portable telephone 110 is in the state of FIG. 23, and a movie is watched by holding the main body unit 3 so as to keep the display device 6 with the shorter side at the top.