1. A microcomputer including: means for processing data; means, coupled to said processing means, for storing data; and means for controlling the processing means and the data storing means, the data storing means including a group of data indicative of the adaptivity degree to fuzzy sets, and an area for storing the result of processing, the microcomputer further including: means, coupled to said data storing means, for designating the group of data; means, coupled to said data storing means, for designating the area for storing the result of processing; means, coupled to said processing means, for storing the conformity degree data; means, coupled to said processing means, for storing the number of processings, the microcomputer internally including a fuzzy inference exclusive-instruction for comparing data in the means for storing the conformity degree data with data designated by the means for designating the group of dam, so as to select a smaller one, and for comparing the selected dam with data designated by the means for designating the area for storing the result of processing, so as to store a larger one at the area for storing the result of processing, designated by the means for designating the area for storing the result of processing, wherein said means for storing the number of processings includes a register for holding a number of data values, wherein said means for designating the area for storing the result of processing and means for designating the group of data each include a register, the above processings being repeated the number of data values in said register included in the means for storing the number of processings, while updating the value of said registers in the means for designating the area for storing the result of processing and the means for designating the group of data, wherein when a plurality of rules are to be elevated, an instruction is executed in a number corresponding to the number of rules to be elevated, while changing the set values of the means for designating the area for storing the result of processing and the means for designating the group of data.