US 6,212,517 B1 · Keyword extracting system and text retrieval system using the same

Abstract

A system for providing keywords to facilitate a search in a text retrieval system. For each of texts constituting a text base, the system creates a word ID of each of words used in the text and a word occurrence count of a corresponding word. The word occurrence count indicates a number of occurrences of a word in each text. For each of words used in any of the texts constituting the text base, the system creates a total word occurrence count and a containing text count indicative of the number of texts containing the word. For each of words contained in the selected texts, a degree of importance is calculated by using the word occurrence count, the total word occurrence count and the containing text count. The words contained in the selected texts are sorted in order of the degree of importance. At least a part of the sorted words are displayed as related keywords.

Claims75

Dependent claims

A method of assisting a user to search a text base in a text retrieval system having a function of receiving a query request and returning a list of text IDs of retrieved texts;

the method comprising the steps of:
for each of texts constituting said text base, managing local statistical information on words, compound words and phrases (hereinafter, referred to en bloc as “words”) used in each said text;
managing global statistical information on words used in any of said texts constituting said text base;
said user selecting at least one text from said text base to provide a selected text list of text IDs of selected texts by user implementation of the steps of:
issuing a query request by using user determined retrieval conditions to obtain a list of retrieved texts, and
selecting at least one text from said retrieved texts;
for each of words contained in said selected texts, calculating a degree of importance by using said local statistical information for said retrieval texts and said global statistical information;
sorting said words contained in said selected texts in order of said degrees of importance;
displaying a predetermined number of said sorted words as related keywords;
and
assisting said user to enter a query request by using said related keywords.

8 more elements

A system for assisting a user to search a text base in a text retrieval system having a function of receiving a query request and returning a list of text IDs of retrieved texts;

the system comprising:
means, operative for each of texts constituting said text base, for managing local statistical information on words used in each said text;
means for managing global statistical information on words used in any of said texts constituting said text base;
means for permitting said user to select at least one text from said text base to provide a selected text list of text IDs of selected texts by permitting said user to issue a query request by using user determined retrieval conditions to obtain a list of retrieved texts and by permitting said user to select at least one text from said retrieved texts;
means, operative for each of words contained in said selected texts listed in said selected text list, for calculating a degree of importance by using said local statistical information for said retrieval texts and said global statistical information;
means for sorting said words contained in said selected texts in order of said degrees of importance;
means for displaying a predetermined number of said sorted words with highest degrees of importance as related keywords;
and
means for assisting said user to enter a query request by using said related keywords.

6 more elements

A text retrieval system capable of assisting a user to search a text base by providing keywords on the basis of at least one preceding search, the text retrieval system comprising:

a multiplicity of texts constituting said text base;
means for managing attribute information on said texts constituting said text base;
means, operative for each of texts constituting said text base, for managing local statistical information on words used in each said text;
means for managing global statistical information on words used in any of said texts constituting said text base;
means for permitting said user to issue a query request;
means responsive to said query request for providing a list of text IDs of selected texts;
means, operative for each of words contained in said selected texts listed in said selected text list, for calculating a degree of importance by using said local statistical information for said retrieval texts and said global statistical information;
means for sorting said words contained in said selected texts in order of said degrees of importance;
means for displaying a predetermined number of said sorted words with highest degrees of importance as related keywords;
and
means for assisting said user to enter a query request by using said related keywords.

8 more elements

Dependencies are inferred from the claim text.

Keyword extracting system and text retrieval system using the same

Life of this patent

Keyword extracting system and text retrieval system using the same

Life of this patent

Abstract

Claims75