Information processing apparatus having function of changing orientation of screen image

An information processing apparatus comprising:

• a housing with a top surface;
• a keyboard placed on the top surface of the housing;
• a display unit with a rear surface and a front surface in which a display screen is exposed, the display unit being supported by the housing and set in one of a first style which allows the display unit to rotate between a closed position in which the keyboard is covered and a first open position in which the display screen and the keyboard are exposed and a second style in which the rear surface covers the keyboard and the display screen is exposed;
• an angle sensor which senses an angle formed between the display screen and the top surface of the housing;
• an orientation sensor which senses an orientation of the display unit relative to force of gravity;
• a placement position sensor which senses which of the first style and the second style the display unit is set in;
• means for varying an orientation of a screen image displayed on the display screen between an orientation in which a bottom-end portion of the screen image is located toward the housing and an orientation in which a top-end portion of the screen image is located toward the housing in accordance with the angle sensed by the angle sensor when the placement position sensor senses that the display unit is set in the first style, and for varying the orientation of the screen image to locate the top-end portion of the screen image in a position higher than the bottom-end portion thereof relative to the force of gravity in accordance with the orientation of the display unit sensed by the orientation sensor when the placement position sensor senses that the display unit is set in the second style.