1. A method of displaying a captured image onto a three-dimensional (3D) electronic map, the method comprising: determining a position of a virtual photographing apparatus within the 3D electronic map corresponding to a position on which a real photographing apparatus is installed in a real world environment; extracting nearest intersecting points, which are positioned on a plurality of virtual view angle vectors, and each of which intersects with one of a plurality of polygons constituting the 3D electronic map in a region around the real photographing apparatus or the virtual photographing apparatus, wherein the plurality of virtual view angle vectors are generated based on view angle information of the virtual photographing apparatus and the position of the virtual photographing apparatus; selecting pixels that are within a range of coordinates of the extracted nearest intersecting points by comparing 3D coordinates of the extracted nearest intersecting points and 3D coordinates of a plurality of pixels constituting the plurality of polygons; converting 3D coordinates of the selected pixels to two-dimensional (2D) coordinates to display the selected pixels on a 2D display; superimposing an image captured by the real photographing apparatus on top of the selected pixels, using the converted 2D coordinates of the selected pixels; and outputting, in real-time, the 3D electronic map, including the superimposed image, on the 2D display.