1. A fuzzy control system for controlling a physical object, the physical object being responsive to a control signal and producing a status signal corresponding to the status of the physical object, the fuzzy control system comprising: means for receiving the status signal from the physical object; means for generating a control reference value; means for selectively calculating a control deviation from the received status signal and the control reference value; operation means, connected to said selective calculating means, for performing a fuzzy inference operation on the control deviation calculated by said selective calculating means and a control deviation contained in a fuzzy rule, the fuzzy rule defined by expert knowledge, to obtain a control deviation membership function; calculating means for calculating matching between a membership function about an internal state of said physical object and a membership function about an internal state variable included in said fuzzy rule to obtain a matching point, and calculating a membership function about the control signal for said physical object and a membership function about a new internal state variable from an internal state variable membership value corresponding to the matching point; means for storing the membership function about said new internal state variable; and means for outputting said control signal to said physical object and controlling the physical object.