An external communication system for a vehicle includes communication devices and a controller. The communication devices are provided in the vehicle. The communication devices are configured to transmit and receive communication data between a server device and the vehicle via mutually different communication paths. The controller is configured to control communication by the communication devices. The communication devices include a first communication device and an inter-vehicle communication device. When the inter-vehicle communication device is requested, from another vehicle, to acquire communication data between the another vehicle and the server device, the controller transmits communication data received by the first communication device from the server device, from the inter-vehicle communication device to the another vehicle, and transmits communication data received by the inter-vehicle communication device from the another vehicle, from the first communication device to the server device.