In order to facilitate a setting of multiple parameters of a tracking function of a camera, in a setting window, an image display window is displayed in which a picked-up image sent from a camera server and an indicator indicating a change detection maximum area as a detection result of an image change detection process by the camera server are superimposingly on the picked-up image. In addition, in the setting window, a window is displayed in which a setting window is displayed which is used to make a setting of a tracking method by referring to an image displayed in the image display window.