COMMUNICATION SYSTEM AND, COMMUNICATION DEVICE AND PROCESSOR CONFIGURING THE COMMUNICATION SYSTEM

A communication system includes: a communication device that receives data from a road-side apparatus and transmits the data as a plurality of data items in block units; and a processor that starts data processing whenever it is determined that a data item is received. The communication device includes a determination device that determines whether load reduction in the data processing is required, and a transmission device that transmits the plurality of data items as a series of data items such that it is not determined that a data item has been received when the load reduction is required. The processor includes an assembly device that divides the series of data items and assemblies the divided data.