A network fault managing system for a network including network elements as nodes includes a fault node indication data storage section, a fault indication data storage section, a flag, a fault node indication data processing section, a fault indication data processing section and an output unit. The fault node indication data storage section stores a fault node indication data set in which fault nodes are managed in a tree form. The fault node indication data processing section receives a fault association notice having a fault occurrence position identifier and a fault indication data, the fault occurrence position identifier indicating a fault node in which a fault has occurred, and the fault indication data indicating data associated with the fault, and determines whether a fault node indication data corresponding to the fault node specified by the fault occurrence position identifier of the fault association notice is present in the fault node indication data set. Also, the fault node indication data processing section generates the fault node indication data based on the fault occurrence position identifier to store in the fault node indication data set of the fault node indication data storage section, when the fault node indication data is not present in the fault node indication data set, and sets the flag.