Patent ID: 6850267

Claim:
A video telephone system for communicating video data between a first terminal device and a second terminal device having mutually different video processing performance, wherein: the first terminal device transmits, before reception of encoded video data, at least one video processing method for reception and a display screen size suitable for video receiving performance of the first terminal device to the second terminal device, the at least one video processing method for reception and the display screen size being notified in a form of at least one attribute; and the second terminal device beforehand stores at least one video processing method for transmission to transmit video data within a range of transmitting performance of the second terminal device, the second terminal device obtains, according to the at least one attribute notified from the first terminal device, video data for transmission from video data to be processed, the video data for transmission having a size equal to or less than the display screen size notified from the first terminal device, the second terminal device selects, from the at least one video processing method for transmission, a video processing method not exceeding video processing performance of the video processing method notified from the first terminal device, and the second terminal device processes video data for transmission according to the video processing method for transmission thus selected to produce encoded video data of the video data for transmission and transmits the encoded video data to the first terminal device.