Nakahara (1995,1999) proposed the notion of assentive constructivism though introducing a viewpoint of agreement within a certain group (quasi-objectivity in the sense of subjective independence, namely commonality beyond each cognizing subject) for the problem of the negation of the objectivity of mathematics in constructivism. Then, he set up the ‘constructive approach’ as a teaching and learning process model that can practically realize his constructivist standpoint as follows.