. "In the determination step, UE ( C , a , e ) = fr ( a , e ) ??? i ??? C , i ??? a fr ( i , e ) + ?? is calculated as specificity UE (C, a, e) for determining specificity of an evaluation expression, wherein, C is a category a is an object, e is an evaluation expression, fr (a, e) is the number of evaluation pair of the object a, fr (i, e) is the number of evaluation pair other than the object a, an" . . . .