| 摘要 |
A plurality of devices and a transmission right assigning device are connected to a transmission line. The transmission right assigning device transmits a transmission request retrieving frame, and then I/F in each device adds, if necessary, transmission request information including emergency degree information on transmission data in own device to a transmitted transmission request retrieving frame to transmit the added transmission request retrieving frame. I/F in the transmission right assigning device retrieves the transmission request retrieving frame added, if necessary, with transmission request information including emergency degree information on transmission data at each of the plurality of the devices. The transmission right assigning unit in the transmission right assigning device assigns the transmission right to one device out of the plurality of the devices, based on the transmission request information included in the retrieved transmission request retrieving frame.
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