PURPOSE: To improve working efficiency by preventing collision, etc., of a container, a crane and a worker with each other in a monitoring method of a container yard.

CONSTITUTION: A container and positions and carrying capacities of the container and a crane are automatically recognized by a picture image processing device 16 in accordance with information input to each of CCD cameras 11 by putting a shape of the container at least in the long side direction and the short side direction in a field of view by a plural number of the CCD cameras 11 arranged in a container yard and grasping a status of the whole area in the container yard by composing information of each of these cameras 11.