An electronic control unit for a vehicle includes a nonvolatile memory that is capable of erasing and writing data electrically, and capable of receiving a program to be written into the nonvolatile memory in units of a predetermined size by means of commu...

A rewriting system in which a rewriting unit (2) transmits rewriting data for each predetermined data transfer unit as a data transfer command together with specified position data which represents a portion to be rewritten which corresponds to the rewriti...