Abstract: To estimate the communication quality of the wireless section in real-time, it is provided a communication management apparatus that manages traffic of a wireless communication system that includes a wireless base station communicating with a terminal, and a gateway apparatus coupled to the wireless base station, the communication management apparatus comprising a processor that executes a program and a storage unit accessed by the processor. The communication management apparatus calculates an estimated value of wireless section throughput between the wireless base station and the terminal using communication quality information obtained from data sent and received by the gateway apparatus.

Abstract: It is an object of this invention to protect a copyright for each of subcontents of a digital content. A computer system, comprising: a content providing server for providing a user terminal with a digital content obtained through digitization; and a copyright management server for managing copyright information on the digital content, wherein the content providing server is configured to: obtain copyright information set for each of subcontents included in the digital content from the copyright management server; associate the obtained copyright information with the each of the subcontents, and add the copyright information to the digital content; and transmit the digital content to which the copyright information is added to the user terminal.