Patent ID: 7945278

Claim:
A method of group communication among three or more communication terminals, the method comprising the steps of: sending a permission request for transmission, while a first communication terminal is transmitting and a second communication terminal is at a top of a waiting list for transmission, from a third communication terminal to a management system; registering the third communication terminal onto the waiting list upon receipt of the permission request; sending notifications of events occurring in the group communication and information relating to the waiting list to all the communication terminals participating in the group communication from the management system; and displaying the events in a text message region of each display screen of the communication terminals participating in the group communication and a list in a list region of the display screen, wherein the events are displayed as text, wherein the list comprises identification data in the waiting list; requesting emergency transmission to change an order of the waiting list to the top of the waiting list by the third communication terminal while the first communication terminal is transmitting; and accepting the change in the order of the waiting list by the second communication terminal.