1. A method of operating a fuzzy inference system for simplifying mesh, comprising the steps of: selecting m attributes of a mesh; characterizing the variation of each attribute m 1 attributes using n 1 fuzzy sets, where 1&lE;i&lE;m; forming n 1 •n 2 •••n m different combinations using the variations of the m attributes and their corresponding n 1 fuzzy sets according to fuzzy inference rules, and then generating n 1 •n 2 •••n m weights of the n 1 •n 2 •••nm different combinations through a first function; performing a second functional evaluation of the variation of the m attributes according to the fuzzy inference rule to obtain n 1 •n 2 •••n m output values; and performing a third functional evaluation using the n 1 •n 2 •••n m weights and the n 1 •n 2 •••n m output values to obtain a cost estimation that can serve as a criteria for simplifying a mesh through data removal.