| 20100281010 | RELAY DEVICE, COMMUNICATION SYSTEM AND COMMUNICATION METHOD - Provided is a relay device in which when data read from a database is transmitted to external devices and the transmission and reception of the data between the external devices is relayed, the communication load of a communication line can be reduced by reducing the transmitting data amount, and the calculation load of each communication device can be reduced, and furthermore, the calculation load of the relay device itself can be reduced. Data required by in-vehicle devices must be generated from data. The relay device does not send the data that is calculation source data for generating the data to each of the in-vehicle devices, but generates the data that is a calculation result, stores the data in the database, and sends the data to the in-vehicle devices as required. In addition, the relay device determines whether data needed to be generated is required to be regenerated or not and, only when it is determined that the already stored data is old and regeneration of the data is needed, regenerates the data using the data. | 11-04-2010 |
