ount extraction process, and a learning process of FIG. 4 subsequent to FIGS. 5A and 5B; FIG. 6 is a flow chart of an evaluation pair learning process of FIG. 4; FIG. 7A is an explanatory diagram of an object extraction process of FIG. 4 for an English document; FIGS. 7B and 7C are explanatory diagrams of an evaluation expression extraction process, an evaluation pair candidate extraction process,