Processing system

A processing system including at least two electronic units of a first electronic unit and a second electronic unit,

• the first electronic unit operating according to a first operation program, comprising:
• first storing means for storing the first operating program;
• and
• first retrieving means for retrieving, from an external unit, a first rewrite program for rewriting the first operation program stored in the first storing means,
• wherein the first electronic unit newly retrieves, from the external unit, a first operation program by executing the first rewrite program retrieved by the first retrieving means to rewrite the first operation program stored in the first storing means using the newly retrieved first operation program,
• the second electronic unit operating according to a second operation program, comprising:
• second storing means for storing the second operating program;
• and
• second retrieving means for retrieving, through the first electronic unit, a second rewrite program for rewriting the second operation program stored in the second storing means,
• wherein the second electronic unit newly retrieves, through the first electronic unit, a second operation program by executing the second rewrite program retrieved by the second retrieving means to rewrite the second operation program stored in the second storing means using the newly retrieved second operation program,
• wherein the first rewrite program includes a transfer routine for transferring the second rewrite program to the second electronic unit, and
• wherein, when the first electronic unit retrieves, from the external unit, a rewrite request for rewriting the second operation program, the first electronic unit executes the transfer routine to transfer the second rewrite program to the retrieving means of the second electronic unit.