Apparatus and method for displaying information

1. An apparatus for displaying information, comprising:

a display unit through which a scene is visible, the scene surrounding the display unit;

a storage unit configured to store a location and a guide of each object existing in the scene;

a viewpoint calculation unit configured to calculate a view point of a user observing the scene through the display unit;

a region estimation unit configured to estimate a region observed by the user in the scene, based on the view point; and

an extraction unit configured to search an object existing in the region based on the location of the object, and to extract the guide of the object from the storage unit;

wherein the display unit displays the guide extracted.

2. The apparatus according to claim 1 , wherein

the location is determined by projecting the object onto a virtual surface surrounding the display unit in a virtual space and by calculating a coordinate of a projection image on the virtual surface, and

the region estimation unit generates a plurality of half-straight lines connecting between the view point and each corner of the display unit in the virtual space, and estimates a region enclosed by cross points of each half-straight line onto the virtual surface, as the region observed by the user in the scene.

3. The apparatus according to claim 2 , further comprising:

a touch panel overlaid on the display unit;

a second conversion unit configured to convert a touch position on the touch panel to a touch position in a world-coordinate system; and

a selection unit configured to select one from guides extracted by the extraction unit, based on the view point and the touch position in the world coordinate system.

4. The apparatus according to claim 3 , further comprising:

a rotation measurement unit configured to measure a rotation angle of the apparatus from a base direction;

wherein the region estimation unit estimates the region observed by the user in the scene, based on the view point and the rotation angle.

5. A method for displaying information, comprising:

storing in a storage unit, a location and a guide of each object existing in a scene, the scene surrounding a display unit and being visible through the display unit;

calculating a view point of a user observing the scene through the display unit;

estimating a region observed by the user in the scene, based on the view point;

searching an object existing in the region based on the location of the object;

extracting the guide of the object from the storage unit; and

displaying the guide extracted on the display unit.