1. A stereoscopic image generation method of background terrain scenes, the method comprising: creating, by using a computer processor, an initial mesh using terrain geometry based on image sequences; generating, by using the computer processor, a projection map; extracting, by using the computer processor, a plurality of feature points of the initial mesh using the projection map; detecting, by using the computer processor, sliding feature points of the plurality of feature points corresponding to error regions of the initial mesh, generating a plurality of vectors for fixing the sliding feature points such that the error regions are corrected, and generating the vector map; generating, by using the computer processor, the corrected mesh using the vector map; and generating, by using the computer processor, a stereoscopic image using the corrected mesh, wherein said extracting the plurality of feature points includes projecting the image sequences to the initial mesh for each frame of the image sequences and generating texture maps, generating visibility maps using a ray tracing method so as to represent a visible area and an invisible area for each frame in the initial mesh, composing the texture maps and the visibility maps so as to generate the projection map, and applying scale-invariant feature transform (SIFT) to the projection map so as to extract the plurality of feature points, and wherein said generating the vector map includes excluding more than one feature points of the plurality of feature points on or near the invisible area if the invisible area of the initial mesh is detected by the visibility maps, determining whether or not each of the remaining plurality of feature points except for the more than one excluded feature points of the plurality of feature points moves, determining positions where the moving feature points are placed, and generating the plurality of vectors to move the moving feature points such that the moving feature points are fixed to the determined positions and generating the vector map.