DOCUMENT RETRIEVAL DEVICE AND COMPUTER READABLE RECORDING MEDIUM RECORDED WITH PROGRAM FOR FUNCTIONING COMPUTER AS THE DEVICE

PROBLEM TO BE SOLVED: To conveniently utilize a retrieved result by turning a retrieval object not to the entire document but to the sub document of the document and obtaining a description in the document directly relating to retrieval conditions as the retrieved result. SOLUTION: This device is provided with an inverted file 102 for dividing respective sentences for constituting the document in a document DB 101 into groups composed of the optional number of the sentences and the sentences for respective paragraphs, etc., defining the divided groups as the sub documents and managing the sub documents and a retrieval server 103 for performing the retrieval processing of the pertinent sub document by using a vector space method based on the retrieval conditions inputted from a client 100.