1. A computer method of gathering and summarizing information available through a network, the method comprising: collecting information from a plurality of network sites according to respective maps of the network sites; converting the collected information from HTML-language web pages to XML-language documents and storing the XML-language documents in a storage medium; searching for documents according to a search query having at least one term and identifying the documents found in the search; and displaying the documents so as to indicate similarity of the documents to each other.