There are provided a method and device for forming a character string image in a predetermined image area based on a plurality of character images each occupying an area for one character, each of the character images being formed of an actual character image and blank images arranged on horizontally opposite sides of the actual character image in a manner immediately adjacent thereto. Actual character images are taken out from the character images, respectively. The thus taken-out actual character images are arranged in the predetermined image area according to a desired sequence, to thereby form the character string image. The thus formed character string image is handled as an equivalent to an image of one character.