1. A surveillance camera terminal comprising: imaging means configured to output a frame image taken by imaging an area in an imaging visual field; imaging visual field control means configured to change the imaging visual field of the imaging means in a surveillance area; object extracting means configured to extract an object being imaged by processing the frame image taken by the imaging means; tracking means configured to detect a position of the object in the surveillance area based on a position of the object extracted by the object extracting means on the frame image and the imaging visual field of the imaging means and then track the object; imaging visual field storage means configured to store therein an imaging visual field for use in handover of the object to each of other surveillance camera terminals to which the object is possible to hand over; and detection means configured to detect whether or not the object being tracked by the tracking means has traveled to a position near a handover area for handover of the object to another surveillance camera terminal, wherein the imaging visual field control means changing the imaging visual field of the imaging means in accordance with the position of the object being tracked by the tracking means in the surveillance area, and wherein when the detection means detects that the object being tracked by the tracking means has traveled to the position near the handover area for handover to another surveillance camera terminal, the imaging visual field control means adjusts the imaging visual field of the imaging means to the imaging visual field for use in handover of the object to the other surveillance camera terminal which is stored in the imaging visual field storage means.