Remote assistance device, remote assistance system, and remote assistance method

Provided are a technology, a remote assistance device, a system, and a method whereby, when performing remote assistance on the travel of a vehicle, the surrounding sound of the vehicle acquired by a microphone of the vehicle can be provided in an appropriate state for a remote operator. A remote assistance device is provided with a data acquisition device, a data processing device, and a sound data reproduction device. The data acquisition device acquires various kinds of data including data of sounds around a vehicle by communicating with the vehicle. A data processing device processes various kinds of data including data of ambient sounds. A sound data reproduction device reproduces the sound data processed by the data processing device. The data processing device separates data of ambient sound into data of vehicle sound representing sound generated along with operation of a vehicle and data of ambient sound representing sound generated in an environment around the vehicle. The data processing device outp