1. A method of texture filtering, the method comprising: determining an upper mipmap and a lower mipmap based on a level of detail (LOD) value corresponding to a quad; obtaining first color values, which are color values of the pixels comprised in the quad, corresponding to the upper mipmap, by using a coordinate representing coordinates of the pixels comprised in the quad, when each pixel comprised in the quad and each corresponding texel of the upper mipmap match; obtaining second color values, which are color values of the pixels comprised in the quad, in which the color values of the pixels correspond to the lower mipmap, with respect to each pixel comprised in the quad; and obtaining third color values of the pixels of the quad by using linear interpolation, based on the obtained first and second color values.