Communication method of ethernet network for vehicle

In a communication method of an Ethernet network for a vehicle, a load of a CPU in a reception ECU is reduced by enabling the reception ECU receiving an Ethernet message to receive the message with a changed period. For this, each time a message is transmitted from a transmission ECU to an Ethernet switch, the message is transmitted with a changed period by the Ethernet switch selectively only to a reception ECU determined on the basis of setting information and information included in the transmitted message, thereby controlling a message reception period for each reception ECU.