PURPOSE: To enhance the returning ratio of a reply postcard by adhering a separable sheet to the rear surface of a postcard sheet.

CONSTITUTION: When a reply-paid postcard is prepared, a sender adheres a reply-paid postcard sheet 1 described as predetermined to a reply postcard sheet 2, and mails it to a reply person. In this case, the reply-paid post card sheet 1 is adhered to the reply postcard sheet 2 with adhesive 3, and they are integrated but not separated unless they are purposely separated. Accordingly, it is charged by a fee for one postcard. On the other hand, the reply person who receives this postcard separates the reply-paid postcard sheet 2 into two sheets, the address column 1A of the reply postcard sheet 1 is removed from the reply postcard sheet 1, and adhered to the adhering space at a suitable position of the reply postcard sheet 2. Further, a normal postcard sheet A may be used instead of the replay postcard sheet 1, and a separable sheet B described with a predetermined document, etc., may be used instead of the reply postcard sheet 2.