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Document retrieval apparatus

  • US 6,078,913 A
  • Filed: 02/11/1998
  • Issued: 06/20/2000
  • Est. Priority Date: 02/12/1997
  • Status: Expired due to Fees
First Claim
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1. A document retrieval apparatus connected through a network to a plurality of computers having documents, said apparatus comprising:

  • a contents database for storing index information of the respective documents;

    a cluster database for storing a plurality of node information elements which are linked as nodes of a cluster with a hierarchical tree structure of the documents arranged based on similarity of the documents, each said node information element including end addresses where an update of the cluster generated by a modification or an addition of an individual document located at a lower side of the node is to be posted; and

    a control means for posting the modification or addition of the individual document to the end address in the node information element which encounters while following the link of the cluster when the cluster is updated.

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