Control system for container crane and control method for container crane

A control system for a container crane including a girder extending in one direction, a trolley that is supported by the girder and moves in the one direction in which the girder extends, and a spreader suspended from the trolley with wire, characterized in that

• the control system comprises:
• a camera that is disposed on the trolley and sequentially captures an image of the spreader and a portion below the spreader;
• a display device that sequentially displays the image captured by the camera;
• a position acquisition device that acquires three-dimensional positions of the spreader and a landing surface on which the spreader is to land;
• and
• a control device connected to the camera, the display device, and the position acquisition device, and
• based on the three-dimensional positions of the spreader and the landing surface acquired by the position acquisition device, the control device calculates two-dimensional coordinates, in the image, of a projection point at which a spreader center point, which is the center of the spreader in plan view, is vertically projected on a horizontal plane including the landing surface and a landing-surface center point which is the center of the landing surface in plan view, and superimposes, on the image, a projection mark indicating the projection point and a landing-surface mark indicating the landing-surface center point, an indication display from which it is understood that the positions of the spreader and the landing surface have agreed with each other in plan view, and the control device displays a resultant image with the image and the indication display superimposed on the display device.