The uniqueness of the screen name for each screen of a system to be evaluated is evaluated simply and with high precision. The GUI evaluation system includes GUI information acquisition means 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 the contents of the lowest-level screen name existing in the evaluation target screen are displayed as a title; and screen name evaluation means for evaluating the uniqueness of screen names in the evaluation target system in accordance with the information about the level-specific screen name in each evaluation target screen, the level-specific screen name being acquired by the GUI information acquisition means, and in accordance with the information about the components included in the contents display area of each evaluation target screen.