PURPOSE: To enhance printing efficiency as a whole by providing a means controlling the distribution ratio of the contents of a plurality of bit pattern memories to respective printing parts corresponding to the printing conditions of the printing parts and effectively dispersing printing data load to the respective printing parts corresponding to the printing residual conditions of the printing parts.

CONSTITUTION: A printing control program memory part 41 is provided in a printer control part and a printing code for performing the control and printing of a printer is interpretted herein to develop printing data on a bit pattern. A bit pattern memory 43 having a plurality of memories 431, 432...43n provided thereto in order to store the bit pattern developed by the printing control program memory part 41 and used for the purpose of mainly storing bit patterns of different printing data in the respective memories is provided. How to distribute the bit patterns stored in a plurality of the bit pattern memories 43 to the respective printing parts 5 of a plurality of printers 1, 2 is determined in a printing data distribution control part 42 to control printing.