To provide a streaming contents distribution management system capable of managing reproduction quality at all user's terminals by managing the reproduction quality of the streaming contents at the user's terminals in real time and correctly knowing degradation in the reproduction quality of the streaming contents.

A measurement management section 113 of the user's terminal 110 receives measurement conditions such as measurement parameters from a quality management server 150. A primary parameter acquisition section 114 acquires reproduction information of contents and time information. A parameter analysis section 115 calculates a delay in starting the reproduction and a lag in reproduced scenes as quality-related parameters. A parameter transmission section 116 sends the quality-related parameters together with an identifier such as an audience IP address to the quality management server 150. A parameter management section 153 of the server 150 manages the reproduction quality in real time based on the received identifier and the quality-related parameters.