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Please predict whether this patent is acceptable.PATENT ABSTRACT: A control unit extracts a plurality of potential features each included in at least one of a plurality of teacher data elements, from the plurality of teacher data elements. The control unit calculates the degree of importance of each potential feature in machine learning on the basis of the frequency of occurrence of the potential feature in the teacher data elements. The control unit calculates the information amount of each teacher data element on the basis of the degrees of importance of the potential features included in the teacher data element. The control unit selects teacher data elements for use in the machine learning from the teacher data elements on the basis of the information amounts of the respective teacher data elements.