Patent ID: 8179449

Claim:
Portable electronic apparatus including a display configured to display content; a user position estimating unit for estimating a position of a user with respect to the display; and a display movement estimating unit for estimating movement of the display; and wherein the apparatus is configured for estimating, with the user position estimating unit, an initial position of the user, at a first moment; during an interval of time after the first moment, estimating, with the display movement estimating unit, the display movement, and controlling the display content based on the display movement and the initial position of the user, the apparatus being further configured, before estimating the position of the user, for determining whether a user is present in front of the display, and, wherein controlling the display content based on the display movement and the initial position of the user includes generating, if it is determined that a user is present in front of the display, on the display a three-dimensional effect based on the display movement and the initial position of the user, and if it is determined that no user is present, operating the apparatus in a non-three-dimensional effect mode wherein no three-dimensional effect is generated on the display.