In Japanese university classes, lectures are the most popular styles, while their educational effects have never been investigated up until now. Here in the paper, the quantitative evaluation of the students’ attitude toward the class was investigated through the introduction of The Class Respondence Rate (CRR) system, in order to clarify the problems of lectures and lecturers’ efforts to improve their classes. CRR is a ratio of students’ respondence toward the class management. In the faculty of science and engineering of Setsunan University, our investigation on the CRR results for the lectures showed the lower score, but when some exercises or quizes were given, the CRR score increased drastically. Therefore, we conclude the CRR score can be utilized for the improvement of the class management in terms of its quantitative evaluation of students’ reaction toward the class.