A pile of sheets is held by a separator/feeder and a vibrator is brought into contact with a first region of the pile with a first contact pressure. High frequency vibrations are applied from the vibrator to the sheet. A takeout mechanism is brought into contact with and pressed against the pile with a second contact pressure and sheets are taken out one by one from the top surface of the pile by the takeout mechanism. A first sensor detects the position of the vibrator and outputs a first detection signal, while a second sensor detects the uppermost surface of the pile and outputs a second detection signal. A control section selects first and second contact pressures according to the first and second detection signals and maintains the first and second contact pressures.