"Legitimate Peripheral Participation" approach (LPP) is one of the most important perspective to situated learning, which is proposed buy Jean Lave and Etienne Wenger. The purpose of this article is to draw an outline of this approach and examine its perspective to situated learning and methodology of learning study. I the LPP approach, situated learning is understood as "situated social ... [Show full abstract] practice" which presupposes dynamic relations between "community of practice" and subjects as "whole persons". By comparing with L. S. Vygotsky's theory, the basic methodology of the LPP approach was identified as an "unit of analysis method". Some problems of the LPP approach was also discussed shortly.