TRANSMISSION SYSTEM, COMMUNICATION DEVICE, TRANSMISSION MANAGEMENT DEVICE, TRANSMISSION METHOD, COMMUNICATION METHOD, TRANSMISSION MANAGEMENT METHOD, AND PROGRAM

摘要

PROBLEM TO BE SOLVED: To provide a transmission system that obtains communication history allowing users to judge a time when communication quality has been deteriorated.SOLUTION: A transmission system including a plurality of communication devices comprises: a first measuring unit that measures a first amount of data which is obtained by the communication between a prescribed communication device and another communication device from the start of communication to the end of the communication, at a prescribed interval at the prescribed communication device side; a second measuring unit that measures a second amount of data obtained by the communication between the other communication device and the prescribed communication device from the start of the communication to the end of the communication, at the prescribed interval at the other communication device side; a calculation unit that calculates time when the communication quality of the communication has been deteriorated by comparing the first amount of data with the second amount of data; and a history management unit that generates communication history including information on the time when the communication quality of the communication has been deteriorated.SELECTED DRAWING: Figure 10