The purpose of this study is to elucidate consumer communication behavior on social media from the concept of identity and ethical consumption. First, development of research methods for consumer communication behavior led to the analysis of the relationship between emotion and identity based on consumption style by text mining. Second, research on the motivation and consciousness for ethical consumption showed that identity and empathy promote ethical consumption. Finally, extraction of messages posted by consumers on SNS and analysis on self-expression and relationship building between consumers was conducted.