PROBLEM TO BE SOLVED: To provide a knot classification device, a knot classification method, and a knot classification program capable of automating the knot classification work and improving the yield in the knot cutting process. According to a clause classification device, a clause classification method, and a clause classification program, a spectral spectrum of a clause to be classified is received, and classification data of the clause is received with respect to an input based on the received spectral spectrum. Based on the model that outputs, the classification data corresponding to the received spectral spectrum is determined. The model is a learning model generated by machine learning based on teacher data, which is a set of the spectral spectra of the classified clauses and the classified data of the classified clauses. [Selection diagram] Fig. 1
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