| 摘要 |
The objective of the present invention is to provide a technology that improves the visibility of an additional display even if a user changes the viewpoint. In order to accomplish the objective, the present invention generates video information by imaging the external visual scene of a user (S11), and extracts from the video information a specific object 12 information of which is to be provided to the user (S12). In addition, the direction of the line of sight of the user is detected to generate line-of-sight direction information (S02). Then, a direct visual field area that is a visual field when the user views the external visual scene through a display screen is calculated from the line-of-sight direction information of the user through the semi-transparent display screen which is a display screen to display the video information and which allows the user to directly view the external visual scene through the display screen, and an imaging visual field area that is a visual field when the external visual scene is imaged is calculated (S03). From an additional information storage unit that stores therein, in an associated manner, additional information indicating information on specific objects, the additional information that is associated with the extracted specific object is extracted (S17). A relative positional relationship between the imaging visual field area and the direct visual field area is calculated (S18), and by using the relative positional information, the extracted additional information is displayed on the display screen so as to follow the movement of the direct visual field area (S19). |
