CPC H04L 43/0817 (2013.01) [H04L 43/0823 (2013.01); H04L 43/0864 (2013.01); H04L 43/0888 (2013.01)] | 15 Claims |
1. A network management device that divides a plurality of terminal devices connected to a network into a plurality of groups, transmits transmission data to the plurality of terminal devices, and receives response data corresponding to the transmission data to acquire connection states of the plurality of terminal devices, the network management device comprising at least one of:
an individual error determiner configured to determine that an individual error occurs in a target terminal device belonging to a group among the plurality of groups when a difference between (i) a response time from a transmission time of the transmission data to a reception time of the response data for the target terminal device and (ii) a first reference time is larger than a first predetermined value; and
a group error determiner configured to determine that a group error occurs in a target group to which two or more terminal devices belongs among the plurality of groups when a difference between (i) a current average response time that is an average value of the response time for each of the two or more terminal devices and (ii) a second reference time is larger than a second predetermined value.
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