Video monitoring device, video monitoring system, video monitoring method, and storage medium storing video monitoring program

A video monitoring method executed by a computer, the method comprising:

• acquiring position information indicating a position of a mobile object as a moving target object;
• commanding image capturing directions of a plurality of movable cameras provided at predetermined positions;
• evaluating a viewability level of the mobile object in a video captured by each of the plurality of movable cameras based on the position of the mobile object and the positions of the plurality of movable cameras;
• automatically selecting a movable camera for use for image capturing of the mobile object from the plurality of movable cameras based on the viewability level;
• automatically controlling the selected movable camera so that the movable camera is directed toward the mobile object;
• and
• displaying the video of the mobile object captured by the selected movable camera on a monitor screen,
• wherein the viewability level is evaluated based on an angular speed of swiveling of each of the plurality of movable cameras necessary for each of the plurality of movable cameras to keep sight of the mobile object, and
• wherein the method further comprises automatically selecting and controlling the movable camera, based on the angular speed of swiveling of each of the plurality of movable cameras.