VEHICULAR COMMUNICATION DEVICE

A vehicular communication device is communicable with each of an external communication device disposed outside a vehicle and at least one electronic control device. The vehicular communication device: receives the data from the external communication device and transmits the data to the at least one electronic control device; calculates an estimated power amount for writing the data into the at least one electronic control device; obtains a remaining battery power in a battery; and determines execution or suspension of data transfer.