| 摘要 |
PURPOSE:To improve the retrieving efficiency of a Japanese sentence data base via a key word and to reduce the key word memory capacity, by utilizing the information on the word emerging positions of a thesaurus to delete improper key words. CONSTITUTION:A noun is extracted 4 out of a key word extracting object Japanese sentence and a prefix, a suffix and a numeral are deleted 8 out of the extracted noun by means of a prefix dictionary 6 and a suffix dictionary 7. The the undesired words are deleted 10 undesired word dictionary 9 and the remaining nouns are collated 12 with a thesaurus 11 to extract key word candidates. The key word candidates having the lower order words in the thesaurus 11 are deleted 14 out of the key word candidates 13. If the one of these deleted works is contained in the header of the Japanese sentence or equal to the first work of the end of a paragraph, the relevant word is registered 15 again into the table 13 as candidate. Then each of the words stored in an extracted noun table 5 is collated with an important word dictionary 16 and these collated words are registered 17 into the table 3 as the key word candidates. Then the fixed key words are sent to a result output part 8.
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