COMMUNICATION SYSTEM, COMMUNICATION METHOD, INFORMATION RECORDING MEDIUM, AND PROGRAM

摘要

It is possible to detect an unauthorized operation such as modification of setting of a router device to invalidate the result of a communication match in a communication match game. In the communication system, a first terminal device (211) and a second terminal device (221) try a communication with a terminal device of a communication partner. If the trial has failed, a communication is tried with a router device used by the terminal device of the communication partner. Results of these communication trials are specified in the connection information state and transmitted to a server device (231). The server device (231) receives the connection information state and checks the communication state of each terminal device, a first router device (212) connected to the first terminal device (211) and a second router device (222) connected to the second terminal device (221). If the communication-enabled path is asymmetrical, the server device (231) judges that a user of the terminal device has performed an unauthorized operation.