1. A GUI evaluation system for evaluating a text input component on a screen to be evaluated and included in the evaluation system, comprising: a processor; a test data recording section for storing plural pieces of test input data different in character attribute; an evaluation data specifying section for specifying, as an evaluation data set, data on a test input data combination selected from the plural pieces of test input data stored in the test data recording section and corresponding to a text input component into which each data is input, wherein no warning message is displayed for the test input data combination when these pieces of input data are input into all text input components on the screen to be evaluated and input is completed; a consistency determination section for determining whether there are text input components having an identical item name on a plurality of screens to be evaluated but different in data input condition to determine consistency of data input restrictions on the text input components having an identical name; an input result acquiring section for acquiring, as input result information, information configured to specify whether a warning message is displayed when test input data to be input into one text input component are sequentially changed from a state where each test input data in the evaluation data set specified by the evaluation data specifying section is input into the corresponding text input component and input is completed, the content of the warning message if the warning message is displayed, and information indicative of test input data input when the warning message is displayed; and an input result information outputting section for outputting the input result information acquired by the input result acquiring section in association with the text input component on the screen to be evaluated.