1. A screen controlling apparatus comprising a display section that displays a plurality of first buttons for switching a plurality of different languages and at least one second button, which is displayed in a first language, on a screen; and a display controlling section that controls a display of the first buttons on the screen; a memory accessible to the display controlling section that stores at least one text instance table for the different languages, where the text instance table contains character codes for each of the different languages; wherein the display section displays, at positions corresponding to the first buttons on the screen, characters in the different languages which are to be switched to by the respective first buttons; and when one of the first buttons is selected, the display controlling section accesses the text instance table to retrieve selected character codes in a language switched to by the selected one of the first buttons, and the display section displays on the screen, at a position corresponding to the at least one second button, which is displayed in a second language, selected characters based on the retrieved character codes, without changing the display of the plurality of first buttons for switching a plurality of different languages.