Vehicle control device and program update system

A program update system, comprising:

• a vehicle control device which is mounted on a vehicle, the vehicle control device having a rewritable nonvolatile memory and an operation unit, the nonvolatile memory having a first storage area and a second storage area which store a control program executable by the operation unit and a plurality of management data storage areas which store management data including current program area information representing whether a storage area storing a current control program to be executed by the operation unit is the first storage area or the second storage area;
• a program write device which is mounted on the vehicle, is connected to the vehicle control device via an in-vehicle network, and controls updating of the control program of the vehicle control device;
• and
• a server which distributes an update package including a control program for update in the vehicle control device to the program write device via wireless communication,
• wherein the program write device transmits an identification number representing the current control program and the current program area information to the server, and
• wherein the server distributes the update package selected on the basis of the identification number and the current program area information transmitted from the program write device, and
• wherein the update package includes
• the identification number representing the current control program,
• the current program area information,
• an identification number representing the control program for update, and
• information representing whether a storage area storing the control program for update is the first storage area or the second storage area.