The invention discloses a realization method of a video telephone. The method comprises calling mode setting step, audio control step, video control step and text control step, wherein in the calling mode setting step, text and image calling mode is set on a mobile terminal; in the audio control step, when the video telephone is started, the mobile terminal turns off a local audio device and sends out an audio-off message to inform a communication opposite terminal to close an audio device of the opposite terminal; in the video control step, when the video telephone is started, the mobile terminal inputs a first video to send to the communication opposite terminal, the communication opposite terminal inputs a second video to the mobile terminal; and in the text control step, when the video telephone is started, the mobile terminal inputs a first text to send to the communication opposite terminal, the first text is displayed on the screen of the communication opposite terminal; and the communication opposite terminal inputs a second text to send to the mobile terminal and the second text is displayed on the screen of the mobile terminal. The invention also provides a corresponding mobile terminal and system of the video telephone. By using the realization method, mobile terminal and system of the invention, the people with auditory handicap can fully communicate through the video telephone and the consumption of communication resource can be reduced.