There is provided a technique which can realize stable loading performance irrespective of the state of a loaded object loaded on a tray. A loading information acquisition unit 106 acquires loading information relating to a sheet loading height on a loading tray 101 on which a sheet subjected to a specified processing is loaded, and a press force adjusting unit 107 moves, based on the loading information, at least one of the loading tray 101 and a pressing unit 104 to press from above the sheet loaded on the loading tray in a direction in which the loading tray and the pressing unit 104 are distanced from each other.