Information retrieving method, information retrieving system, and retrieval managing unit for the same

An information retrieving system, comprising:

• a retrieval managing unit receiving a retrieval request from a client and controlling an operation of a sequential retrieval engine, one of which is contained within each of a plurality of retrieving servers, to make said sequential retrieval engine conduct a retrieval operation in accordance with said retrieval request, said retrieval managing unit using a parallel framework that causes said plurality of retrieving servers to conduct parallel processing by directly using and integrating unmodified operations of said retrieving servers, said parallel framework comprising a calling operation separate from said sequential retrieval engines to call said sequential retrieval engines, with data to be retrieved being substantially equally distributed to said plurality of retrieving servers, said parallel framework establishing parallel connections among said plurality of retrieving servers, and said parallel framework comprising a retrieval request outputting unit for broadcasting retrieval requests from clients to said plurality of retrieving servers one after another without waiting to receive retrieval results from all of said plurality of retrieving servers, to provide parallel control of retrieval operations of said plurality of retrieving servers.