Communication quality management system, communication quality management method, program, and recording medium

A system for uniformly controlling and guaranteeing the quality of communication between a first communication apparatus present in a first ISP network and second communication apparatus present in a second ISP network above a predetermined level. At least part of the communication quality data on the communication path between first and second communication apparatus ( 2, 6 ) is measured by means of a first measurement apparatus ( 3 ) installed in a first ISP network ( 1 A). At least part of the communication quality data on the communication path is measured by means of a second measurement apparatus ( 5 ) installed in a second network ( 1 B). The data measured by the first measurement apparatus ( 3 ) and the data measured by the second measurement apparatus ( 5 ) are collected and controlled by a control apparatus ( 7 ).