1. A monitor system for capturing an image of a monitoring area, the system comprising a plurality of cameras connected via a communication path, wherein each of the plurality of cameras includes: an image capturing device operable to capture an image of an image capturing area included in the monitoring area, and to change the image capturing area; a communication unit operable to transmit, to another camera via the communication path, image capturing characteristics information for identifying the image capturing area, and to receive image capturing characteristics information from said another camera; an image capturing characteristics change unit operable to change the image capturing area by controlling the camera based on the image capturing characteristics information of the camera and the image capturing characteristics information of said another camera received by said communication unit so that the image capturing area of the camera and the image capturing area of said another camera have a predetermined relation.