A control center transmits failure information transmission request
information to a vehicle. The vehicle receives the failure information
transmission request information transmitted from the control center. A
navigation ECU and a gateway ECU obtain failure information from each ECU
in cooperation with each other. At this time, the gateway ECU determines
whether a data volume of the failure information is larger than a
predetermined information volume. When it is determined that the data
volume of the failure information is larger than the predetermined
information volume, the gateway ECU divides the failure information into
plural pieces, and outputs each piece of information. Also, the ECU does
not output the failure information, which is output to a network built in
the vehicle, to the navigation ECU, while a failure information obtaining
device is connected. Meanwhile, the control center does not receive the
failure information while the failure information obtaining device is
connected.