The purpose of this paper is to suggest a new scale for analyzing the Japanese cultural concepts called “UCHI” (in group), “SOTO” (out group) and “YOSO”. Not only Japanese but many other languages also have a similar division based on social relationships. However, these concepts have traditionally been viewed as reflecting a uniquely Japanese character. This paper rethinks the notion that this division is the result of the natural use of language in Japan and proposes a new scale through which to analyze this division. This new scale is based on quality and quantity of information from a pragmatic perspective using sentence ending particles and verbs, such as psychological verbs, to express the inner information of the user. This paper suggests that a better understanding of the role of “UCHI”, ”SOTO” and ”YOSO” in the Japanese language and culture, and whether such a division is uniquely Japanese or universal, will help in the Japanese acquisition of Japanese Second Learners.