| 摘要 |
A terminal apparatus attaches an in-writing signal to an e-mail by a command processing portion and develops the in-writing signal into a sending buffer during the period of writing received rewriting data. The terminal apparatus sends the e-mail to a center apparatus. In addition, after the terminal apparatus performs writing all the rewriting data and completes rewriting firmware, the terminal apparatus attaches a rewriting completion signal to e-mail by the command processing portion and develops the rewriting completion signal into the sending buffer. The terminal apparatus sends the e-mail to the center apparatus. The center apparatus judges that rewriting the firmware in the terminal apparatus is completed when the center apparatus receives the rewriting completion signal after receiving the in-writing signal from the terminal apparatus.
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