A machine control system includes a display device to display operation information to operate a machine, an external storage device which stores personal information to identify an operator and a screen of the operation information displayed by the operator on the display device in association with each other, and an authentication unit to authenticate the operator based on the personal information stored in the external storage device. A controller reads out, from the external storage device, the operation information screen displayed on the display device by the operator authenticated by the authentication unit, and displays the same on the display device.