<；P>；PROBLEM TO BE SOLVED: To properly replace a national language which a display device has so that the national language to be displayed by the display device is properly displayed corresponding to a place where a working machine is used or the like. <；P>；SOLUTION: The display device 25 for displaying the information of the working machine 1 includes: a language writing device 40 for writing a plurality of national languages as a national language group so that information can be displayed with a plurality of national language； a language replacement commanding device 41 for outputting a replacement command to replace at least one of the national language in the national language group with the other language to the display device 25 in which the national language group is written； and a language replacement device 42 for replacement the national language in the national language group with the other national language based on the replacement command of the language replacement commanding device 41. <；P>；COPYRIGHT: (C)2010,JPO&INPIT
