The OpenBook system using a book metaplhor allows a user to leaf through a set of nodes retrieved from a hypermedia just like a book. While leafing thrcmgh the book, the reader does not need to pay attention to the detailed description written in pages, but impressive information such as chapter titles and figures catches reader's eyes. In other words, leafing through an electronic book takes advantage of a cognitive capability to skim the outlines of the contents. Moreover, the system supports a query-based access mechanism which supports a structure search mechanism for the purpose of finding potentially useful nodes. Furthermore, this paper describes a method of linearizing complex hyper-networked nodes to facilitate high speed browsing, which is a unique aspect of OpenBook. KEYWORDS hypermedia, information retrieval, book metaphor, ISM-CSA