A controller in a vehicle control system includes a communication state determiner that determines a communication state between a facility communicator and a vehicle communicator in each vehicle, and a recorder. When the communication state determiner determines that the communication state between the facility communicator and the vehicle communicator in any vehicle has a communication failure, the controller obtains vehicle state information indicating a state of a target vehicle being the vehicle having the communication failure at at least one data obtaining point in a target period including at least one of a failure-occurrence point or a failure-recovery point of the communication failure, and records the vehicle state information in the recorder.