A switch-over processing method includes the steps of performing a first process on a sheet passing between a first cylinder and a second cylinder with a first mounted body being mounted on a circumferential surface of the second cylinder arranged to oppose the first cylinder, and performing a second process different from the first process on the sheet passing between the first cylinder and the second cylinder with a second mounted body being mounted on a circumferential surface of the second cylinder in place of the first mounted body. A switch-over processing apparatus is also disclosed.