PURPOSE: To enable to reuse a printing paper printed and used, by a method wherein a deleting head capable of deleting information printed on a printing paper is provided on the printing paper supplying side.

CONSTITUTION: A central controller 1 so controls that information fed from, e.g., a typewriter equipped with input keys or an input device 2 for reading input information from a paper tape, a magnetic tape or the like is processed by a calculator 3, is stored in a memory 4, and is printed on a printing paper 7 by a printing mechanism 6 such as a printer provided in an output device 5. The deleting head 8 for deleting original information previously printed on a used printing paper 7 is provided on the printing paper supplying side of the printing mechanism 6, the original information on the used printing paper 7 is deleted by the head 8, and new information is printed by the printing mechanism 6.