An onboard update apparatus including a control unit that controls processing for updating a program of an onboard ECU, wherein the onboard update apparatus is communicatively connected to an external server via a plurality of communication paths; the plurality of communication paths include a communication path via a charging control apparatus that controls charging of the vehicle by a charging apparatus outside of the vehicle capable of communication with the external server, and a communication path via an outside-vehicle communication apparatus installed in the vehicle and capable of communication with the external server; the control unit selects one communication path from among the plurality of communication paths; and an update program is acquired from the external server via the communication path selected.