A network weak point diagnostic system and a method thereof for producing the small number of models and performing vulnerability check about the model are provided to secure the availability of network and the system for performing weak point check about the model. A service integration manager(20) monitors the state change of a node(10) installing service monitoring agents(11). If the status modify is sensed, the service integration manager notifies determination result by determining whether the node is a monitored target. Change information is delivered to a task model generating unit The task model generating updates the model relating to the node in which the status modify is sensed. The task model generating unit requests the weak point checked out of being updated about model. A vulnerability checking manager(40) stores the weak point check result.
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