1. Data base for storing and managing user profile data, the user profile data representing sets of terminal devices ( 9 ) of users in an information transmission network ( 10 ), wherein the data base ( 1 ) comprises respectively for each user at least one customizable user profile which can be created, edited and/or deleted by the user and each customizable user profile is associated with an environment of the user representing a physical location and/or a logical context of the user.