A movable personal computer using system is located inside an instrument panel of a motor vehicle, and has a PC holder on which a movable personal computer is set. The movable personal computer is connectable to a CAN of the motor vehicle, and has a screen showing different information on four partial areas of the screen at the same time. The screen is reflected by a mirror member toward a driver such that the driver sees a virtual image of the screen. The mirror member is moved to show a virtual image on a partial area of the screen, which displays information different from another partial area of the screen, and selectively shifts from the one partial area to the another partial area of the screen.