Patent ID: 8279284

Claim:
A video display apparatus comprising: a reception unit configured to receive a plurality of sequence of video signals output from a plurality of cameras; a storage unit configured to store the plurality of sequence of video signals received by the reception unit; a display unit configured to include first and second display areas; and a control unit; the control unit comprising: a first controller configured to selectively and time-divisionally display the plurality of sequence of video signals received by the reception unit on the first display area; a second controller configured to generate, during a period when a video signal of a first camera is displayed on the first display area, a plurality of still videos in time sequence on the basis of video signals of a section, which has not been displayed on the first display area, of video signals which have been captured by the first camera, and display the plurality of generated still videos on the second display area; and a third controller configured to compare each of the plurality of generated still videos with the same sequence of video signals as the corresponding still videos which are displayed on the first display area to calculate the difference between them, and if the difference is equal to or larger than a preset threshold, generates warning information, adds the generated warning information to the corresponding still video, and displays the still video on the second display area.