1. An apparatus for processing character information in which a dot pattern of an input character string is developed in a buffer in accordance with the size of a printing area or a transfer area, the apparatus comprising: line length judging means for recognizing length information of the respective lines of the input character string and judging the existence of a line longer than a threshold length determined by the size of the print area or the transfer area when an instruction for printing development is issued; slewing addition control means responsive to the line length judging means judging the existence of a line longer than the threshold length after the instruction for printing development is issued for automatically dividing a character string longer than the threshold length into two character strings having substantially the same length based upon characters without regard to words, said two character strings being on respective two lines; and character string developing means for developing a character string to which slewing has been added in the input character string.