Patent ID: 7292240

Claim:
A virtual reality presentation device capable of displaying a virtual object in a virtual three-dimensional space and enabling an observer to be immersed in the virtual three-dimensional space and to perform observation, the virtual reality presentation device comprising: an observation mode setting unit configured to set as an observation mode, an actual-size observation mode in which the observer performs observation by being immersed in the virtual three-dimensional space in an actual size or a reduced-size observation mode in which the observer performs observation by reducing the size of a virtual three-dimensional space computer graphics image; a position and orientation information acquisition unit configured to acquire position and orientation information of the observer; and a generation unit configured to generate a computer graphics image from computer graphics data representing the virtual three-dimensional space in accordance with the observation mode set by the observation mode setting unit and the position and orientation information of the observer acquired by the position and orientation acquisition unit when the observation mode is set by the observation mode setting unit.