| 摘要 |
A system for monitoring packets transmitted on a channel (3) connecting an application server (8) and a user (1) of the application server (8) to each other, includes (a) a certification server (5) which certificates a user, and (b) a first device (6) which, on receipt of a request from the certification server (5), monitors packets transmitted on the channel (3). The certification server (5) includes a first memory (9) which stores a monitoring parameter designating a packet to be monitored, and a threshold parameter designating a method of monitoring the packet, and a second device (11) which transmits a request to the first device (6) to start or finish monitoring the packet. The first device includes an analyzer (16) which monitors a time at which packets coincident with the monitoring parameter arrive, and determines whether there is any rule in an interval in the arrival time, and an annunciator (17) which makes annunciation to the user when there is a certain rule in the interval. (Drawing to be published: FIG. 1)
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