7. A GUI evaluation method for evaluating a restriction expression on data input into an input component on an evaluation target screen included in the evaluation system, comprising: extracting an expression element on a plurality of evaluation target screens based on information capable of specifying a restriction on input into an input component; comparing respective extracted expression elements among input components different in restriction on input to specify an expression element indicative of the restriction on input; and determining that a restriction expression indicative of an input restriction is consistent when, among specified expression elements, there is a common expression element on the same input restriction on the plurality of evaluation target screens, or that a restriction expression indicative of an input restriction is inconsistent when there is no common expression element.
7. A GUI evaluation method for evaluating a restriction expression on data input into an input component on an evaluation target screen included in the evaluation system, comprising: extracting an expression element on a plurality of evaluation target screens based on information capable of specifying a restriction on input into an input component; comparing respective extracted expression elements among input components different in restriction on input to specify an expression element indicative of the restriction on input; and determining that a restriction expression indicative of an input restriction is consistent when, among specified expression elements, there is a common expression element on the same input restriction on the plurality of evaluation target screens, or that a restriction expression indicative of an input restriction is inconsistent when there is no common expression element. 9. The GUI evaluation method according to claim 7 , wherein when the restriction expressions are determined to be inconsistent, most-used expression information among the expression elements on the same input restriction is determined to be an optimal restriction expression indicative of the input restriction, and input components that do not correspond to the expression information are determined to be inappropriate in terms of the restriction expressions.