The present disclosure discloses a method and apparatus for processing information. A specific embodiment of the method comprises: acquiring a target behavior information set; selecting, from at least two unique identity identifiers corresponding to at least two groups of identity identifiers, a unique identity identifier as a target unique identity identifier, based on at least one kind of specified user attribute information; and associating, for each target unique identity identifier of the selected target unique identity identifier, behavior information associated with identity identifiers corresponding to the target unique identity identifier with the target unique identity identifier, to obtain behavior information associated with the target unique identity identifier. According to the embodiment of the present disclosure, various kinds of behavior information of a user are associated with the target unique identity identifier, to facilitate utilization and analysis for the behavior information.