Patent ID: 8078584

Claim:
A document retrieving system for retrieving a document from documents registered in two or more document management servers which are connected via a network, the document retrieving system comprising: a storage device, provided with each of the document management servers, configured to store a document and index data corresponding to the document; and a controller programmed to: obtain and collect the index data corresponding to one or more documents each satisfying a first retrieval condition from the storage device of each of the document management servers via the network, without retrieving the one or more documents each satisfying the first retrieval condition; determine whether or not a second retrieval condition is the same as the first retrieval condition, the second retrieval condition being newly designated by a user; and retrieve a document satisfying the second retrieval condition by: transmitting a query, which includes the second retrieval condition, to all of the document management servers, in a case where the second retrieval condition is determined to be not the same as the first retrieval condition; and transmitting the query to only one of the document management servers that stores the collected index data, without transmitting the query to any other document management server, in a case where the second retrieval condition is determined to be the same as the first retrieval condition; manage log information of the second retrieval condition designated by the user; and collect, in a case where, based on the log information, the second retrieval condition satisfying a predetermined collecting condition is determined to exist, the index data corresponding to the document satisfying the second retrieval condition.