PROBLEM TO BE SOLVED: To reduce a calculation time when an estimation value of a communication traffic matrix volume in a communication network is calculated by the TomoGravity method.;SOLUTION: A communication traffic matrix calculation device 10 collects IF unit traffic information 131 and route information 132 in a communication network 40, and calculates a pseudo inverse matrix pinv (A) of a matrix A representing the route information 132 in advance. In this case, when there is no change in the route information 132 (that is, there is no change in topology of the communication network), an estimation value (t) of a communication traffic matrix volume is calculated using the pseudo inverse matrix pinv (A) that has been calculated in advance. When there is a change in the route information 132 (that is, there is a change in the topology of the communication network), the pseudo inverse matrix pinv (A) is calculated again based on the changed route information 132, and the communication traffic matrix calculation device 10 calculates an estimation value (t) of a communication traffic matrix volume using the re-calculated pseudo inverse matrix pinv (A).;COPYRIGHT: (C)2010,JPO&INPIT
展开▼
