A method, system and computer program product for improving the efficiency of changing or modifying a message displayed by a program. A memory unit stores a message read and displayed by the execution of a program, associating it with a language in which the message is written. An execution unit reads from the memory unit and displays the message corresponding to a language set by a user by executing the program. An editing unit edits the message stored in the memory unit and stores the edited message into the memory unit, associating it with a different language from that of the unedited message. A setting unit changes the language of the message displayed by the execution unit, where the execution unit reads from the memory unit and displays the message corresponding to the language changed by the setting unit thereby displaying the edited message instead of the unedited message.