7. The method according to claim 5 , wherein, when the number of documents commonly owned by a first cluster and a second cluster is greater than or equal to a threshold, build the links between the cluster page of the first cluster and the cluster page of the second cluster.
5. A method for linking documents, comprising a computer performing the steps of: obtaining a set of documents, wherein documents in the set of documents are not interlinked with other documents via one or more hyperlinks; forming a plurality of clusters from the set of documents, each cluster comprising one or more documents; building a cluster page for each cluster to represent the documents in the cluster; and building links based on analysis of the contents of the clusters and the documents; wherein, when a similarity of a topic of a first document of the set of documents to a second document of the set of documents is greater than a threshold, a link is built from the first document to the second document, the similarity being a cosine function of an angle between a topic vector of the first document and the document vector of the second document; wherein said step of building links comprises one or more of the following steps: building the link between the cluster pages; building the link from the cluster page to the document; building the link from the document to the cluster page; and building the link between the documents; wherein, when the similarity of a document and its cluster is greater than a threshold, generate a link from the document to the cluster page of the cluster, the similarity is a cosine function of the angle between the document vector of the document and the centroid vector of the cluster, and the centroid vector is the arithmetic average value of the document vector.