An information processing device according to the present invention stores user attribute data and pieces of application attribute data. The information processing device retrieves the user attribute data (Sa1), retrieves application attribute data of running application programs (Sa3), and determine whether there is application attribute data matching the user attribute data (Sa5). If the determination is affirmative, the information processing device identifies an application program corresponding to the application attribute data, and subsequently identifies a window (subject window) corresponding to the identified application program (Sa6). The information processing device sets priority levels for the subject window and windows overlapping the subject window so that the priority level for the subject window is higher than those of the windows (Sa8), and changes a display order of the subject window and the windows in accordance with the priority levels for the subject window and the windows (Sa9).