Provided is a wakefulness assistance device for inducing wakefulness in the driver of a vehicle. The wakefulness assistance device is provided with: a driver state determination unit for determining, on the basis of information detected by a driver state detection sensor for detecting the state of the driver of the vehicle, whether or not the driver is feeling sleepy; and a conversation command information output unit for outputting, to a conversation device, conversation command information for the driver to have a conversation with the driver of another vehicle. When it is determined by the driver state determining unit that the driver is feeling sleepy, the conversation command information output unit outputs, to the conversation device, start information for starting the provision of a conversation environment, the start information being contained in the conversation command information.
WAKEFULNESS ASSISTANCE DEVICE, METHOD, AND PROGRAM