The present invention relates to a character information processor in which limitation is imposed on an allowable number of a character string to be printed. The character information processor includes: storage means for storing an address file and a non-address character-string file in the same storage area thereof; an address file management table containing a management number, a registration flag representing whether or not an address file is registered in connection with the management number, address information representing a storage area of the storage means in which the address file associated with the management number is stored, and a proximate flag representing whether or not the address file associated with the management number is edited at the time immediately before the current time; and address file edit managing means for managing and editing the address file and the non-address character-string file which are stored in the same storage area of the storage means while distinguishing them from each other using the address file management table.