In a relay communication system, if a request to perform a first remote operation on a first client terminal selected based on relay server information is received from a third client terminal, then a first relay server relays an operation event and image data, which are operation data of the first remote operation performed based on the first remote operation request, via an operation-performing session established between the second relay server and the first client terminal. If a monitoring request to monitor the first remote operation is received from a second client terminal, then the first relay server establishes a monitoring session with the second client terminal and transmits the operation data of the first remote operation via the monitoring session. As a result, a terminal other than the terminal that performs the remote operation or the terminal that undergoes the remote operation is capable of acquiring the content of the remote operation.