In order to transmit fixed-image/text drawing data to print a character contained in a fixed image placed at a predetermined position of paper and body-text drawing data to print a body (text) image in a body, a host apparatus gives the unique download (DL) font ID using a numeric value in different numeric area to each text drawing data stored in external memory attached to a printer. The printer stores the text drawing data identified by the DL font ID in the external memory and upon reception of an image formation command, the printer reads the text drawing data from the external memory and forms an image. Thereby, appropriate text drawing data can be used to print.