1. A method for reconstructing a 3D shape model of an object by using multi-view image information, the method comprising: inputting multi-view images obtained by photographing the object from multiple viewpoints in a voxel space containing voxels of a predetermined size in a 3D space containing the object, and extracting silhouette information and color information of the multi-view images; reconstructing visual hulls by silhouette intersection using the silhouette information; approximating polygons of cross-sections of the visual hulls to a natural geometric shape of the object by using the color information, along the cross-sections of the visual hulls; expressing a 3D geometric shape of the object by connecting the approximated polygons to create a mesh structure; extracting color textures of a surface of the object by projecting meshes of the mesh structure to the multi-view image; and creating a 3D shape model by modeling natural shape information and surface color information of the object that contain the mesh structure and the color textures corresponding to the meshes of the mesh structure.