PURPOSE: To easily perform the proper adjustment of molding even by an amateur by applying molding temp. data and molding pressure data subjected to fuzzy inference to a molding machine to control the molding machine.

CONSTITUTION: When a molded product is discharged from a molding machine, the shape of the molded product is checked by both of the first and second sensors 2, 3 to detect burr quantity B and sink quantity H. The burr quantity B and the sink quantity H are inputted to a fuzzy inference apparatus 4 and the correction data (t), (p) of the molding temp. T and molding pressure P are respectively subjected to fuzzy inference in the fuzzy inference apparatus 4. The correction data (t), (p) are applied to a molding machine 1 to adjust the molding temp. T and molding pressure P of the molding machine 1. By this method, a molded product having no burr and sink is always molded.