| 摘要 |
PROBLEM TO BE SOLVED: To establish availability improvement and load distribution by a small number of computer resources while maintaining the consistency of data. SOLUTION: A client device 101 of a document retrieval system 100 issues a document retrieval request, and a distribution device 102 distributes a document retrieval request from the client device 101 to document retrieval servers 200 and 300, based on a retrieval range. The distribution device 102 distributes the document retrieval request from the client device 101 to the document retrieval servers 200 and 300 according to the retrieval range and the operating status of the document retrieval servers 200 and 300 so that when one document retrieval server breaks down, the other document retrieval server can function by proxy. Index transferring parts 207 and 307 transfer index information for reflecting a retrieval index generated by index generating parts 201 and 301 on auxiliary retrieval index storage parts 308 and 208 of the other document retrieval servers 300 and 200. COPYRIGHT: (C)2007,JPO&INPIT
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