Operation system, communication terminal, a communication system, method of operation, and program

A in response to the operation request by the communication terminal, when operating the communication terminal of the communication partner, noise or accompanying the input of the operation request, the image of a user inputting an operation request, communicate via a session between communication terminals It is transmitted to the other party of the communication terminal. A terminal management system 80, when a communication session sed to transmit image data and sound data generated in the call terminal 10a to the call terminal (10b, 10c) is established, the call terminal PC20a sent receiving a communication ID of 10a. Management system 50, the operation instruction based on the request by the PC 20a, and transmits to the call terminal as a communication partner of the call terminal 10a (10b, 10c).