Users are highly valued nowadays in different industries. Understandings of the user can greatly influence the success of systems and interface design. The goal of this research project is to understand web users' information behavior from related literature, and to discover whether web designers know their users and implement the understandings in their design. This paper synthesizes and presents four aspects of web users' behavior, which are physical, situational factors, cognitive style, and socio-culture aspects; details of behavior related phenomena are described.