Server and Vehicle Control System

The server includes an infrastructure cooperation section determination unit that determines an infrastructure cooperation section indicating a range in which an in-vehicle device performs a cooperative operation with an infrastructure sensor and performs traveling support of the host vehicle, and transmits cooperative operation information for the in-vehicle device to start or stop the cooperative operation with the infrastructure sensor to the in-vehicle device based on the infrastructure cooperation section determined by the infrastructure cooperation section determination unit. The in-vehicle device sets or cancels the cooperative operation mode by the mode setting unit based on the cooperative operation information transmitted from the server.