In an electronic control apparatus, a wireless data control section includes a wireless data reception section that moves wireless data stored in a first wireless data storage unit to an intermediate wireless data storage unit, and a wireless data management section that moves the wireless data stored in the intermediate wireless data storage unit to a second wireless data storage unit. An in-vehicle data control section includes an in-vehicle data reception section that moves in-vehicle data stored in a first in-vehicle data storage unit to an intermediate in-vehicle data storage unit. Herein, a process performed by the wireless data reception section takes precedence over a process performed by the in-vehicle data reception section and over a process performed by the wireless data management section.