PURPOSE: To obtain a one-side recorded paper from a both-side original at higher speed than in the conventional manner at such a time.

CONSTITUTION: Only the odd numbered pages of the both-side original D are consecutively recorded on one side of the recording papers P, which are successively housed in an interchange tray 19. Then, only the even numbered pages of the both-side original D are consecutively recorded on one side of the new recording papers P, and the one-side recorded paper where the even numbered page of the original is recorded and the one-side recorded paper where the odd numbered page of the original is recorded, and which are already housed in the tray 19, are alternately ejected, so that the one-side recorded paper is obtained from the both-side original in order of page at high speed without inverting the original from a surface to a back surface one by one.