3. The GUI evaluation system according to claim 1 , wherein the GUI information storage section stores GUI information that concerns heading included in an evaluation target screen and includes information indicative of a heading expression for the heading and information indicative of an on-screen position of the heading; and the heading group specification section achieves grouping by specifying the headings that are included in the evaluation target screen and agree with each other in the employed expression and in either the vertical or horizontal on-screen position, as members of the same heading group, in accordance with the GUI information stored in the GUI information storage section.
4. The GUI evaluation system according to claim 3 , wherein, when a heading belonging to a first heading group is positioned within an evaluation target screen and above the leftmost heading belonging to a second heading group, the heading group specification section identifies the difference between the horizontal position of the leftmost heading belonging to the second heading group and the horizontal position of the heading belonging to the first heading group as an indent for the second heading group; and the heading expression evaluation section compares the heading expressions and indents for heading groups between two of the plurality of evaluation target screens and, when any of the heading groups included in an evaluation target screen having a relatively small number of heading groups disagrees with all the heading groups included in the other evaluation target screen, concludes that the heading expressions are not consistent.