A system and method for translating character strings into another national language and displaying the translated character strings without updating any source code. The character strings are displayed on GUI environment upon the execution of the object computer program. The method for displaying character strings on GUI environment provided by a computer program comprises the steps of; (a) providing an executable program; (b) providing a text file including the character strings and being openable with the executable program; (c) executing the executable program (301); (d) retrieving the text file from the executable program (307); and (e) displaying the character strings included in the opened text file (315).