A rendering method, comprising: selectively implementing one of performing and not performing texture mapping on respective graphics data by applying a texture corresponding to a 2-dimensional image to an object represented by 3D graphics data based on a respective fog effect applied to the respective graphics data; characterized in that a performance level of rendering of the graphics data is controlled based on a predetermined threshold value being selected from a memory comprising a plurality of predetermined threshold values, wherein the performance level indicates a reduction of the number of memory access operations for reading textures; wherein the rendering method further comprises: calculating a strength of the respective fog effect that is to be applied to the respective graphics data, such that the selective implementing of the texture mapping on the respective graphics data is based upon a comparison of the calculated strength of the respective fog effect and the predetermined threshold value; and determining whether to perform the texture mapping on the respective graphics data such that the selective implementing of the texture mapping is based upon a result of the determining operation; wherein the calculating of the strength of the respective fog effect further comprises: calculating a fog factor value of each pixel of a triangle as a constituent unit of at least one object represented by the graphics data; wherein, in the determining of whether to perform the texture mapping, the texture mapping is performed on the triangle only if a fog factor of a vertex, whose depth value is minimum of depth values of vertices of the triangle, is greater than a predetermined threshold value; and wherein as the fog factor value of a certain vertex becomes smaller, the original color of the vertex gradually disappears. calculating a strength of the respective fog effect that is to be applied to the respective graphics data, such that the selective implementing of the texture mapping on the respective graphics data is based upon a comparison of the calculated strength of the respective fog effect and the predetermined threshold value; and determining whether to perform the texture mapping on the respective graphics data such that the selective implementing of the texture mapping is based upon a result of the determining operation; wherein the calculating of the strength of the respective fog effect further comprises: calculating a fog factor value of each pixel of a triangle as a constituent unit of at least one object represented by the graphics data; wherein, in the determining of whether to perform the texture mapping, the texture mapping is performed on the triangle only if a fog factor of a vertex, whose depth value is minimum of depth values of vertices of the triangle, is greater than a predetermined threshold value; and wherein as the fog factor value of a certain vertex becomes smaller, the original color of the vertex gradually disappears. calculating a fog factor value of each pixel of a triangle as a constituent unit of at least one object represented by the graphics data; wherein, in the determining of whether to perform the texture mapping, the texture mapping is performed on the triangle only if a fog factor of a vertex, whose depth value is minimum of depth values of vertices of the triangle, is greater than a predetermined threshold value; and wherein as the fog factor value of a certain vertex becomes smaller, the original color of the vertex gradually disappears.