Nec Corporation

Hiroshi Yoshimachi

Yuri Kuroda

A multicast transmission system includes a server and a plurality of terminal devices, the servers and the terminal devices connected through a network. Each terminal device includes data transmission means for transmitting data to the server during a PTT call, and output means for receiving counting result data from the server and outputting the counting result data. The server includes counting means for counting or tallying up data received from the terminal devices, and counting data transmission means for transmitting the counting result data to the terminal devices used by members of the PTT call.

Multicast transmission system and data distribution method

A PTT communication system includes a plurality of terminals having respective PTT buttons, a management server for managing advertisements or contents, and a PTT communication server for controlling a token for PTT communications. When the PTT button of either one of the terminals is pressed, the PTT communication server assigns a token to the terminal with the pressed PTT button, and sends communication data from the terminal with the pressed PTT button to another terminal. When the PTT button of any one of the terminals is not pressed, the PTT communication server assigns a token to the management server which is equipped with no PTT button, and distributes advertisements or contents selected by the management server to which the token is assigned to the terminals.

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Tokyo, Japan

Hiroshi Yoshimachi