A user preference information structure having a multiple hierarchical structure in which an information is provided to a user according to a user preference in a multi-media environment consisting of an information provider and an information user, comprising user use information by using information...http://www.google.de/patents/US20060129544?utm_source=gb-gplus-sharePatent US20060129544 - User preference information structure having multiple hierarchical structure and method for providing multimedia information using the same
