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(12) United States Patent ao) Patent No.: us 6,665,668 Bi
Sugaya et al. (45) Date of Patent: Dec. 16,2003
(54) DOCUMENT RETRIEVAL METHOD AND SYSTEM AND COMPUTER READABLE STORAGE MEDIUM
(75) Inventors: Natsuko Sugaya, Kawasaki (JP);
Katsumi Tada, Kawasaki (JP);
Tadataka Matsubayashi, Yokohama
(JP); Akihiko Yamaguchi, Yokohama
(JP); Yasuhiko Inaba, Yokohama (JP);
Yousuke Ushirqji, Osaka (JP)
(73) Assignee: Hitachi, Ltd., Tokyo (JP)
( * ) Notice: Subject to any disclaimer, the term ol this patent is extended or adjusted under 35 U.S.C. 154(b) by 158 days.
(21) Appl. No.: 09/645,561
(22) Filed: Aug. 24, 2000
(30) Foreign Application Priority Data
May 9, 2000 (JP) 2000-142232
(51) Int. CI.7 G06F 17/30
(52) U.S. CI 707/6; 707/5
(58) Field of Search 707/1, 2, 3, 4,
707/5, 6, 101, 102; 345/589
(56) References Cited
U.S. PATENT DOCUMENTS
5,926,808 A * 7/1999 Evans et al 707/1
6,026,409 A * 2/2000 Blumenthal 345/589
6,289,353 Bl * 9/2001 Hazlehurst et al 707/101
A document retrieval system is provided which has a document display interlace which is easy to recognize the important portions even il a document retrieved by using a query expression designated by a document or a long sentence is displayed. When a text is registered, predetermined character strings and location information which are extracted from the text are stored in a location information file. A weight ol each character string is calculated by a predetermined method and is stored in a weight file. In retrieving a document, predetermined character strings are extracted from a designated query expression. A similarity is calculated between the query expression and texts in the database by using the location information and the weights acquired from the location file and the weight file. In displaying the document, character strings having the high weights are extracted from the character strings used for the retrieval. Then, the display format ol a portion which contains the extracted character strings is changed to display the text.
12 Claims, 15 Drawing Sheets
WORDS IN DATABASE
(factors Jnformation, help, human, operation, retrieval, systems)
QUERY EXPRESSIONE :human factors in information retireval systems
(factors,information,help,human .operation,retrieval,systems) Q0=( 1 , 1 ,0,1,0,1,1)
DOCUMENT 1: CONTAINS factors, information, human and retrieval
V1 = (1,1,0,1,0,1,0)
DOCUMENT 2: CONTAINS factors, help, human and systems
DOCUMENT 3: CONTAINS factors, operation and systems
V1 = (1,1,0,1,0,1,1)
RANKING USING WEIGHTS
V1 = (2,3,0,5,0,3,0)
V1-Q0=(2,3,0,5,0,3,0) = 13
Football match stadiums for W-Cup will be determined next month, selection right attributed to Association. The organizing arrangement committee for the 2002 football world cup under the joint auspices of Japan and Korea opened on 29th, a governor/mayor meeting is held by calling special directors from fifteen local self-governing bodies which are candidates for organizing the stadium. For the number of stadiums in Japan, Federation International de Football Association (FIFA)...
football, W-Cup, match, stadium, next, month, determined, selection, right, Association, Japan, Korea, joint, auspices, world, cup, organizing, arrangement, committee, place, candidates,...
DOCUMENT 123 SCORE "100"
DOCUMENT 003 SCORE "95"
DOCUMENTOR SCORE "70"
DOCUMENT 089 SCORE "60"
Reduction in the number of W-Cup football stadiums will be determined next month, The organizing arrangement committee for the 2002 football world cup (W-Cup) announced, to the local self-governing bodies of candidates, Federation Internationale de Football Association (FIFA) draft that the number of match stadiums in this nation is reduced smaller than six to ten Under the joint auspices of Japan and Korea
Yamagata Prefecture arranged to form a football team joining JFL.
The football association of Yamagata Prefecture determined to form a football team joining JFL and an arrangement room will be opened next month .By attending at this arrangement room, invitation of investors for forming a football team, selection of match stadiums and the like are arranged . As the candidates of stadiumses