Video surveillance system and video surveillance method

A video surveillance system comprising:

• a plurality of surveillance cameras;
• a video converting and combining unit configured to combine a plurality of videos captured by the respective surveillance cameras into one combined video;
• an encoder configured to encode the combined video combined by the video converting and combining unit;
• a decoder configured to decode the combined video transmitted from the encoder through a transmission line;
• a video converting and splitting unit configured to split the combined video decoded by the decoder into the videos captured by the respective surveillance cameras;
• and
• a display device configured to display on a display screen the videos captured by the respective surveillance cameras inputted from the video converting and splitting unit,
• wherein when combining the videos captured by the plurality of surveillance cameras into one combined video, the video converting and combining unit appends assignment information in which each of the surveillance cameras that captured the plurality of videos, rotation information indicating application of a rotation process, and division information indicating whether the corresponding video is a left half video or a right half video are associated with one another, and
• wherein the video converting and splitting unit splits the combined video into a plurality of videos based on the assignment information.