EXTRACTION SYSTEM

PROBLEM TO BE SOLVED: To quickly and surely collect words in the field same to that of a small number of words input by a user. SOLUTION: This extraction system is provided with input positive examples that are the plurality of small number of input words, a database D storing a fixed volume of document data, a pattern extraction part 1 for performing full text retrieval of the input positive examples that have been input in the database, and for extracting a pattern appeared in the periphery of the plurality of input positive examples, and a word extraction part 2 for performing full text retrieval of the pattern extracted by the pattern extraction part 1 in the database D, and for extracting an expression extracted by the pattern, and the word extraction part 2 is precluded from extracting an expression including a character type not existing in the input positive examples. COPYRIGHT: (C)2006,JPO&NCIPI