Network monitoring and controlling apparatus

A network monitoring and controlling apparatus for monitoring and controlling a transmission network formed by a plurality of transmission apparatus, said network monitoring and controlling apparatus comprising:

• a path information storing unit for storing path information on an entrance point for inputting data, an exit point for outputting said data, and a path via point for relaying said data, regarding a path through which said data passes and which path connects a transmission apparatus for inputting said data to said transmission network with a transmission apparatus for outputting said data from said transmission network;
• a quality information periodic collection unit for periodically collecting quality information of a channel corresponding to said entrance point and a channel corresponding to said exit point;
• a quality deterioration detecting unit for determining whether or not quality of the path is deteriorated on a basis of the quality information of said entrance point and said exit point;
• a path via point searching unit for, when said quality deterioration detecting unit determines that said quality of the path is deteriorated, searching said path information storing unit and obtaining information on said path via point of the path deteriorated in quality;
• a path via point quality information collection unit for collecting quality information of a channel associated with to said path via point on a basis of the information on said path via point;
• and
• a quality deterioration point identifying unit for determining whether or not a deteriorated path via point is present on a basis of the quality information of said path via point.