Document retrieval method and system and computer readable storage medium

A document retrieval method according to claim 2, wherein

• said information-of-important-string display step includes:
• a very important string extraction step of calculating a degree of importance of said substring by a predetermined method to extract a predetermined number of substrings in a descending order of said degree of importance;
• and
• an information-of-very-important-string display step of displaying a contribution factor to the calculation of said location information or said similarity of said substring extracted at said very important string extraction step;
• said important substrings are a predetermined number of substrings extracted in the descending order of the degree of importance at said very important string extraction step;
• and
• said information of said important substrings includes the contribution factor to the calculation of said location information or said similarity of said important substring.

A document retrieval method for a text database which stores document information as character code data, comprising:

• a document registration step of extracting a predetermined substring and location information of said substring in registration-target text data from said registration-target text data to store said substring and said location information as a location information file;
• a document retrieval step of extracting a predetermined substring from a query expression and extracting a retrieving substring from a part or all of said predetermined substring to calculate a similarity by using location information of said retrieving substring acquired from said location information file and by a predetermined method, said similarity being a degree of similarity between contents of said query expression and contents of a text in said text database;
• and
• a document display step of displaying a text designated by a user among texts whose similarities are calculated by said document retrieval step, wherein
• said document display step includes a display character format change step of selecting an important substring from said extracted retrieving substring based on said calculated similarity to change a display character format of a portion which contains said important substring in said designated text.

A document retrieval system for a text database which stores document information as character code data, comprising:

• document registration means for extracting a predetermined substring and location information of said substring in a registration-target text data from said registration-target text data to store said substring and said location information as a location information file;
• document retrieval means for extracting a predetermined substring from a query expression and extracting a retrieving substring from a part or all of said predetermined substring to calculating a similarity by using location information of said retrieving substring acquired from said location information file and by a predetermined method, said similarity being a degree of similarity between contents of said query expression and contents of a text in said text database;
• and
• document display means for displaying a text designated by a user among texts whose similarities are calculated by said document retrieval means,
• wherein said document display means includes a display character format change means for selecting an important substring from said extracted retrieving substring based on said calculated similarity to change a display character format of a portion which contains said important substring in said designated text.

A storage medium for a text database which stores document information as character code data, and for storing a program for configuring a document retrieval system, comprising:

• a document registration module for extracting a predetermined substring and location information of said substring in a registration-target text data from said registration-target text data to store said substring and said location information as a location information file;
• a document retrieval module for extracting a predetermined substring from a query expression and extracting a retrieving substring from a part or all of said predetermined substring to calculate a similarity by using location information of said retrieving substring acquired from said location information file and by a predetermined method, said similarity being a degree of similarity between contents of said query expression and contents of a text in said text database;
• and
• a document display module for displaying a text designated by a user among texts whose similarities are calculated by said document retrieval module,
• wherein said document display module includes a display character format change module for selecting an important substring from said extracted retrieving substring based on said calculated similarity to change a display character format of a portion which contains said important substring in said designated text.