To provide a substrate processing system which can cause different display portions to output different displays, and cause different operations to be carried out from different operation screens. A substrate processing system, on login information of a user being input from a main display device, refers to the login information, a user group parameter, with which is set a group to which the user belongs, and an authority parameter, which sets an authority of the group, and causes the main display device to display a main operation screen corresponding to the user, while it, on login information of a user being input from an external operating apparatus, causes an external display device to display an external parameter setting screen for setting an authority parameter of a group to which the user belongs, or to display an external operation screen corresponding to the group to which the user belongs.