The book "Nonverbal Behavior/Communication of Using Mobile Phone" by Takashi Nakamura offers an in-depth analysis of the nonverbal communication that arises from the use of mobile phones. In an era where mobile devices are ubiquitous, the work explores the motivations and intentions behind the frequent glance at the screen. It discusses the nonverbal signals sent to companions when displaying the screen and the emotions that arise when the mobile phone is set aside. By applying communication theories and intercultural approaches, it creates a comprehensive understanding of these everyday behaviors. The book is aimed at professionals in the fields of mobile communication, nonverbal communication, intercultural studies, as well as anyone interested in behavioral sciences. It provides valuable insights into the social dynamics shaped by mobile phone usage.