An object detection system includes: a false detection storer to store one or more items of false detection information; an object detector to detect an object from an input image, compare object detection information corresponding to the object with the false detection information, and output a notification corresponding to the object detection information when false detection information corresponding to the object detection information does not exist; and a feedback receiver to receive a user response to the notification and, when a detection error response to the notification is received, store the object detection information corresponding to the notification as false detection information in the false detection storing unit, wherein the object detector does not output the notification when the object corresponding to the false detection information stored in the false detection storer is detected.