| 摘要 |
The communication form of each terminal which participates in PTT communication is registered in a call control server in advance. When performing PTT communication, a call control server ( 100 a) detects the communication form of each terminal. As a result, speech data is extracted from moving image data transmitted from a transmission terminal and is delivered to a speech PTT terminal which can receive only speech data (S 11 , S 12 ). On the other hand, moving image data transmitted from a transmission terminal is delivered to a moving image PTT terminal compatible with moving image data without any change (S 13 ). This makes it possible to implement PTT communication in accordance with the communication form of each terminal.
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