1. A screen-phone capable of providing one or more of a plurality of available functions as selected by a user from an initial tree menu of said functions displayed on a display, said initial tree menu being a default menu which is displayed first on said display, said screen-phone comprising: modeling means for developing a behavioral model of the user's behavior in making selections from the initial tree menu, the behavioral model taking into account the user's preferences and relative inexperience in regard to each of said selections; and menu adjusting means for modifying the initial tree menu in accordance with said behavioral model to form a modified tree menu and changing said default menu to said modified tree menu.