Position and orientation determining method and apparatus and storage medium

   
   

A viewing transform matrix indicating a position and a orientation of an HMD is generated according to a signal indicating the position and the orientation of the HMD. On the other hand, a landmark and its position are detected based on a captured picture, and a correction matrix .DELTA.Mc is generated based on the detected position of the landmark. The position and orientation of the HMD is corrected by using a viewing transform matrix and a correction matrix .DELTA.Mc generated in the above mentioned processes, a picture of a virtual object is generated according to an external parameter indicating the corrected position and the orientation of the HMD, and a picture of augmented reality is generated. The generated picture of the augmented reality is displayed on a display unit.

 
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