The present disclosure relates to a sheet processing system allowing a user to easily remove a sheet from a sheet pressure bonding unit when a jam occurs. A control method for the sheet processing system includes conveying a sheet, pressurizing, for a predetermined time, a plurality of conveyed sheets by a pressurizing unit, detecting an occurrence of a jam of the conveyed sheet or sheets, and controlling the pressurizing unit to release a pressurized state by the pressurizing unit even if the predetermined time has not elapsed in a case where the occurrence of the jam is detected while the plurality of sheets is being pressurized.