Patent ID: 8345668

Claim:
A video delivering system comprising: a video delivering device which sends more than one video stream at the same time; and a video relaying device which transfers the received video streams sent from the video delivering device to a video receiving device, wherein the video delivering device determines a respective delivery time of one or more of the video streams based on time information of a video image therein, adds the respective delivery time to the one or more of the video streams, and sends the video streams to the video relaying device according to common time information common to the video streams, wherein said video relaying device transfers the received video streams to the video receiving device according to the common time information and the respective delivery time added to the one or more of the received video streams, and wherein the video relaying device has a memory unit which records the received video streams containing the time information for the video image and the delivery time added to the one or more of the video streams, when the video streams containing the time information for the video image are received, and detects that another one of the video streams containing the time information for the video image that is sent from the video delivering device has been discarded by knowing the respective delivery time added to the one or more of the video streams.