PROCESSING DEVICE, SERVER DEVICE, OUTPUT METHOD, AND PROGRAM

According to the present invention, there is provided a processing device () which includes a sound collection unit () that collects an environmental sound outside a vehicle with plural microphones and a processing unit () that amplifies the environmental sound collected by the sound collection unit () and causes the amplified sound to be output to an inside of the vehicle. The processing unit () sets an amplification factor of the environmental sound collected by some microphones to be different from an amplification factor of the environmental sound collected by other microphones.