OPERATION ASSISTANCE SYSTEM AND OPERATION ASSISTANCE METHOD

An operation assistance system includes: a motion recognition unit that recognizes predetermined motion of a hand of a vehicle occupant; a position recognition unit that recognizes a first relative position corresponding to a relative position of the hand of the vehicle occupant with respect to a first vehicle; a specifying unit that specifies a second on-vehicle device of a second vehicle that is operated by using an operation unit of the second vehicle provided at a second relative position that is a relative position with respect to the second vehicle and corresponds to the first relative position; and a control unit that assists an operation for a first on-vehicle device of the first vehicle, the first on-vehicle device including a function common with that of the second on-vehicle device.