A user interface system for a vehicle , comprising: a detachable interface apparatus detachably attached to any one of a plurality of display units provided in the vehicle ; and a user interface apparatus provided in the vehicle , comprising: the plurality of display units , and a processor configured to, when it is determined that the detachable interface apparatus is attached to any one of the plurality of display units , display a preset user menu corresponding to a type of a selected display unit , to which the detachable interface apparatus is attached, on the selected display unit , characterized in that , the user interface apparatus further comprises an interface unit , and the processor is further configured to: when it is determined, based on vehicle state information acquired through the interface unit , that the vehicle is in an autonomous mode, output a first menu to the detachable interface apparatus which is separate from the plurality of display units ; and when it is determined, based on vehicle state information acquired through the interface unit , that the vehicle is in a manual mode, deactivate the detachable interface apparatus which is separate from the plurality of display units . a detachable interface apparatus detachably attached to any one of a plurality of display units provided in the vehicle ; and a user interface apparatus provided in the vehicle , comprising: the plurality of display units , and a processor configured to, when it is determined that the detachable interface apparatus is attached to any one of the plurality of display units , display a preset user menu corresponding to a type of a selected display unit , to which the detachable interface apparatus is attached, on the selected display unit , characterized in that , the user interface apparatus further comprises an interface unit , and the processor is further configured to: when it is determined, based on vehicle state information acquired through the interface unit , that the vehicle is in an autonomous mode, output a first menu to the detachable interface apparatus which is separate from the plurality of display units ; and when it is determined, based on vehicle state information acquired through the interface unit , that the vehicle is in a manual mode, deactivate the detachable interface apparatus which is separate from the plurality of display units . the plurality of display units , and a processor configured to, when it is determined that the detachable interface apparatus is attached to any one of the plurality of display units , display a preset user menu corresponding to a type of a selected display unit , to which the detachable interface apparatus is attached, on the selected display unit , characterized in that , the user interface apparatus further comprises an interface unit , and the processor is further configured to: when it is determined, based on vehicle state information acquired through the interface unit , that the vehicle is in an autonomous mode, output a first menu to the detachable interface apparatus which is separate from the plurality of display units ; and when it is determined, based on vehicle state information acquired through the interface unit , that the vehicle is in a manual mode, deactivate the detachable interface apparatus which is separate from the plurality of display units . when it is determined, based on vehicle state information acquired through the interface unit , that the vehicle is in an autonomous mode, output a first menu to the detachable interface apparatus which is separate from the plurality of display units ; and when it is determined, based on vehicle state information acquired through the interface unit , that the vehicle is in a manual mode, deactivate the detachable interface apparatus which is separate from the plurality of display units . <EOS>