IN-VEHICLE DEVICE

An in-vehicle device is an in-vehicle device mounted in a vehicle, including a communication unit configured to communicate with a server device via a line for mobile communication, and a controller configured to change a route for autonomously driving the vehicle in response to occurrence of an event of road traffic, and transmit information on the changed route to the server device, in which the controller is configured to maintain, when a communication failure occurs in the line, the route even when the event has occurred.