1. A printing controller having a printer driver configured to display a GUI using language-dependent files containing display character strings of corresponding languages, the printing controller comprising: a compressed language-dependent file into which the language-dependent files are compressed; a language selection part configured to cause one of the languages which one is used by the printer driver to be selected; and an expansion part configured to expand one of the language-dependent files related to the selected one of the languages from the compressed language-dependent file, wherein the printer driver displays the GUI using the one of the language-dependent files expanded by the expansion part.