VEHICLE-MOUNTED RELAY DEVICE AND INFORMATION PROCESSING METHOD

Disclosed is a vehicle-mounted relay device that relays data flowing through a vehicle-mounted network mounted in a vehicle, including a control unit that controls processing relating to relaying of the data, wherein the control unit derives a threshold relating to a state of the vehicle-mounted network, and determines, based on the derived threshold, whether or not there is an abnormality in the vehicle-mounted network.