1. An anisotropic texture filtering method using area coverage weight of sub-texel precision comprising: step of executing filtering by applying weights to texels enclosed in a rectangular region enclosing a footprint that is mapped from a pixel onto the texture area; step of using a multiplication of the footprint area coverage weights of sub-texel precision and the Gaussian filter value as said weight for the relevant texel; step of representing four sides of the footprint by four linear equations surrounding the footprint in clockwise sequence for computing said area coverage weight of sub-texel precision; step of obtaining sub-texel masks from table by addresses given by values of line equations on substituting slope of the lines and coordinates of the texels; and step of calculating the final area coverage weight by logically bit-by-bit multiplying four sub-texel masks obtained in the previous step.