| 摘要 |
A network system which comprises a plurality of networks, a single or a plurality of terminal devices connected to each of the plurality of networks, and a plurality of manager units for relaying data transferred between the terminal devices and for transmitting to the networks broadcasting communication data having a destination address for broadcasting and also having its own address to be used as a transmission originator, which is arranged to reduce the useless holding of routing information on decision of a communication path in the system so as to minimize the necessary memory capacity of each terminal device, monitors an elapse time after acquisition of the routing information and an elapse time after the last utilization thereof and, when any one of these elapse times exceeds their predetermined threshold times, deletes the associated routing information and its related information.
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