Video surveillance system and video surveillance method

A video surveillance method performed by a first surveillance camera, a second surveillance camera and at least one processor comprising:

• capturing an image of a partial area of a surveillance target place by the first surveillance camera;
• detecting an abnormal state on the basis of the image captured by the first surveillance camera, wherein the abnormal state is one of a passing across the video surveillance line of a predetermined number or more of a target object, or a target object's intruding, exiting, appearing, disappearing, fighting, staying, roving, falling down, standing up, crouching down, changing the moving direction, reverse traveling, shoplifting, detouring, damaging, carrying away, leaving behind or painting graffiti in a surveillance region, or a movement of the target object of a specific route defined by a line segment, wherein the target object is one of a person, an animal or a vehicle;
• controlling the second surveillance camera such that the second surveillance camera captures an image of an area close to the partial area after the detection of the abnormal state;
• and
• capturing the image of the area close to the partial area by the second surveillance camera after the controlling,
• wherein the surveillance target place is one of a street of a city, a large-scale commercial facility, an airport, a terminal station, a railway platform, a leisure facility, a sports facility, a stadium or any other facilities requiring being surveilled.