An evaluation data specifying section specifies, as an evaluation data set, a test input data combination selected from plural pieces of test input data and for which no warning message is displayed when these test input data are input into all text input components on the screen to be evaluated and input is completed. An input result acquiring section acquires, as input result information, information capable of specifying 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 specified evaluation data set is input into the corresponding text input component and input is completed, the content of a warning message if the warning message is displayed, and information indicative of test input data input when the warning message is displayed.