The invention discloses a high definition video conference system comprising a plurality of transmitting terminals and a receiving terminal. Each transmitting terminal comprises a digital imaging/processing apparatus and a first data processing apparatus. The receiving terminal comprises a second data processing apparatus and at least one display apparatus. The digital imaging/processing apparatus is used for capturing an image of a participant and for compressing the captured image into a high definition image. According to a standard communication protocol, the first data processing apparatus converts the high definition image into a standard-format communication image and then transmits the standard-format communication image. The second data processing apparatus is used for receiving and decoding the standard-format image transmitted from each transmitting terminal into the high definition image. Accordingly, the high definition can be displayed on the display apparatus.