Web personalization is one of the major concerns of Web intelligence. It is noticed that the two components of Web, users and services, can be understood from multiple views in forms of hierarchies, and each hierarchy is organized by a multilevel structure. A unified model is proposed for including all personalization styles. The unified model with multilevel hierarchy structures add new understandings and insights into the Web personalization issues. More concise and precise recommendations can then be studied and pursued based on this multilevel model.