The present invention relates to a method for displaying hierarchical structures. The method of the present invention can display graphically hierarchical structures of nodes from the nodes that are branch points, relay points or end points corresponding to apparatuses or functions and the connection...http://www.google.com.hk/patents/US6222559?utm_source=gb-gplus-share專利 US6222559 - Method and apparatus for display of hierarchical structures
