The article is an attempt to clarify the position of book in the social-cultural space. Book is treated as semiotic text in the cultural system (semiosphere) and the integral message in the social-cultural communication. We analyze the sign system of book and the influence of the material factor at the interaction of signs and of the perception of semiotic text (book). The process of creating a book is described on basis of the Joint action theory (T. Wójcik and T. Zbersky) in this article. Thus we analyze the problem of the authorship of text: shows that manufacturers of books always bring new information to author’s message. Special emphasis is paid to observation of peculiarities of the aesthetic function of message-book. We suppose that book, as text of the culture and as material artifact at the same time, is the space for interaction between different elements and functions of the cultural discourse.