In a communication terminal device, in a case where the arrangement of the windows is changed in a list screen, an overhead screen is initially displayed, in which the list screen is overviewed, and the arrangement of the windows is subsequently changed in the overhead screen, and a magnified screen (original screen) of the overhead screen, in which the arrangement of the windows has been changed, is displayed last, as described in the foregoing. By displaying a magnified image, it is possible to make windows better visible in a small display area of a mobile phone. Also, in a case where a window exists that cannot be displayed in a magnified screen, by displaying an overhead screen, it becomes possible for a user to recognize a fact that a window that cannot be displayed exists in a magnified screen, and also recognize a position of the window.