Patent ID: 8743873

Claim:
A train communication system that is configured in a formation of a train constituted by one or more vehicles, the system comprising: a communication relay device that is installed in each of the vehicles of the train and is connected to an inter-vehicle communication path and an in-vehicle communication path; and one or more communication terminal devices that are installed in each of the vehicles of the train and are connected to the communication relay device in a same vehicle by the in-vehicle communication path, wherein the system is configured to: determine vehicle information indicating a formation position of a vehicle within the train in which one of the communication relay devices is installed, and determine communication identification information to be provided to the communication terminal device based on the vehicle information and a correspondence table that defines a correspondence relationship between the communication identification information and the vehicle information for each communication terminal within the train, wherein the communication identification information is a unique IP address for each communication terminal within the train.