PURPOSE: To obtain character strings according to the composition rule and to keep the balance of character strings by continuing character strings containing front and back space characters to prevent them from being dull due to the addition of half size space.

CONSTITUTION: The system consists of an input means 1, control section 3, character string storage section 4, front space/back space character storage section 5 or the like. Generally, when front space characters are inputted, a half size space is added just before the front space character and when back space characters are inputted, a half size space is added just after the back space character to be combined to the character string. In the general processing, a half size space is omitted to prevent it from being dull character string in case a front space character changes from half size space to front space characters, or changes back space characters from half size space characters to front space characters, or changes back space characters from half size space to half size space to front space characters.