Terminal apparatus, remote control system, and remote control method

A remote control method that performs remote control on a driving operation of a vehicle, the vehicle being configured to move by remote control in a factory in which a plurality of manufacturing steps is performed to manufacture the vehicle, a plurality of functional units that implements a plurality of functions necessary for the remote control being mounted on the vehicle in the plurality of manufacturing steps,

• the remote control method comprising:
• acquiring information of at least one of:
• (i) step information indicating the manufacturing step performed on the vehicle and (ii) communication availability information indicating whether communication with at least one of the functional units is available;
• identifying a complement target function of the plurality of functions necessary for the remote control, wherein, the complement target function being a function that is not implemented by any of plurality of the functional units already mounted on the vehicle, based on the acquired information;
• detachably mounting one or more terminal apparatuses having the identified complement target function on the vehicle from among a plurality of terminal apparatuses each having one or more of the complement target functions;
• and
• changing software of the terminal apparatus so as to change functions to be implemented by the terminal apparatus such that, among the plurality of functions necessary for the remote control, only the identified complement target function is implemented by the terminal apparatus, based upon the determination that the identified complement target function is not implemented by any of the plurality of the functional units already mounted on the vehicle.