AUTOMOBILE ARITHMETIC OPERATION DEVICE

An automobile computing device (6) includes: a wireless communication unit (2) configured to receive software update information from an external network (90); a storage unit (63) configured to store software update information received from the wireless communication unit (2); an update controller configured to update software based on the software update information stored in the storage unit (63); and a power controller configured to control a power supply to each constituent of the computing device. In a case where software update information is stored in the storage unit (63) and a driving mechanism of an automobile (1) is not in operation, a power controller (66) energizes the storage unit (63), an update controller (64), and software of an update target indicated by the software update information and the update controller (64) updates software of the update target.