In contrast to recommending new books and to enhance utilization of one's own books, we 1) propose to build a knowledge base (KB) by collecting book information using Web services, 2) develop a book utilization system (BUS) that enables users to edit additional book information by using an XML database, 3) use a book search using Web service. We also create an infrastructure for sharing existing books among users by extracting featured keywords from KB for individuals' preference visualization. Our book search methodology makes it possible to find and suggest use of available books about "XML", when a user looks for books about "XQuery" by searching Web resources using Web Service.