1. A GUI evaluation system comprising: a GUI information acquisition section for acquiring a screen name that is classified according to a hierarchical level and displayed in an evaluation target screen possessed by an evaluation target system, in accordance with screen name designation information for indicating a screen name display location used to display at least part of information equivalent to a screen name in a screen of the evaluation target system, the screen name designation information being indicated as classified according to a hierarchical level within a hierarchical structure formed by screen names, and acquiring information about components used in a contents display area where contents of a lowest-level screen name existing in the evaluation target screen are displayed as a title; and a screen name evaluation section for evaluating a uniqueness of screen names in the evaluation target system in accordance with information about the level-specific screen name in each evaluation target screen, the level-specific screen name being acquired by the GUI information acquisition section, and in accordance with the information about the components included in the contents display area of each evaluation target screen.