Chat system, dummy client system for chat system, and computer readable medium storing dummy client program

A chat system comprising:

• a chat server to which a plurality of clients is able to access via a communication channel, and which provides a chat environment where an utterance transmitted from any one of clients is sent out to other clients, and
• a dummy client device including a communication part accessing the chat server as a client through a communication channel, a monitoring part monitoring the content of utterances set to said chat server from said other clients, a determination part determining whether the content of the utterance monitored by the monitoring part satisfies a predetermined sentence condition, and a process execution part, when the determination part determines that an utterance satisfies the predetermined sentence condition, executing a process corresponding to the predetermined sentence condition in accordance with the content of the utterance.