| 摘要 |
A gateway for avoiding unnecessary increase of communication traffic through a communication bus on the side to which data is sent by subjecting only the actually required information to gateway processing. If it is judged that the contents of the received data relate to a command requiring no gateway processing, the gateway processing is inhibited. If it is judged that the contents of the received data represent information to be subjected to gateway processing only when the contents vary, comparison is made with the latest contents of the same kind of information stored in a memory, and it is judged whether or not the contents do not vary. If the contents are judged to have varied the gateway processing is inhibited.
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