4. The storage medium according to claim 1 , wherein in the evaluation pair extraction step, as extension information, a document ID, an evaluation expression ID, a network address including URL, a type of the object whether the object is a unique noun or a general noun are further added to the evaluation pair in which the object and the evaluation pair are combined.
4. The storage medium according to claim 1 , wherein in the evaluation pair extraction step, as extension information, a document ID, an evaluation expression ID, a network address including URL, a type of the object whether the object is a unique noun or a general noun are further added to the evaluation pair in which the object and the evaluation pair are combined. 13. The storage medium according to claim 4 , wherein the evaluation pair analysis step has a filtering processing step of counting the appearing number of the evaluation expression for each network address from the evaluation pair database, and eliminating the evaluation pair of the network address having the appearing number which is equal to or more than a predetermined threshold value from the evaluation pair database.