1. A surveillance camera terminal comprising: imaging means configured to output a frame image obtained 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 a first object to be tracked, from one or more objects imaged in the frame image; tracking means configured to detect a position of the first object in the surveillance area based on a position of the first object extracted, by the object extracting means, from the frame image and the imaging visual field and then track the first object; imaging visual field storage means configured to store an imaging visual field of the imaging means imaging a handover area in which the first object is positioned when the first object is handed over to each of other surveillance camera terminals to which the first object is possible to be handed over; identification means configured to: projective-transform a first handover frame image and a second handover frame image into a common coordinate system, the first handover frame image being obtained by the imaging means imaging the handover area with the imaging visual field of another surveillance camera terminal to which the first object is handed over, that is stored in the imaging visual field storage means and the second handover frame image being obtained by the another surveillance camera terminal imaging the handover area with the imaging visual field used when the first object is handed over between the surveillance camera terminal and the another surveillance camera terminal, and identify the first object included in one or more second objects imaged in the hand over area by associating, on a one-to-one-basis, the second objects imaged in the handover area between the first handover frame image and the second handover frame image based on a position of each of the second objects in the first handover frame image and a position of each of the second objects in the second handover frame image that have been projective-transformed into the common coordinate system; and detection means configured to detect whether or not the first object that is being tracked by the tracking means has traveled to a position near the handover area for handover of the first object to the another surveillance camera terminal, wherein the imaging visual field control means changes the imaging visual field of the imaging means in accordance with the position of the first object that is being tracked by the tracking means in the surveillance area, and wherein, when the detection means detects that the first object that is being tracked by the tracking means has traveled to the position near the handover area for handover to the another surveillance camera terminal, the imaging visual field control means adjusts the imaging visual field of the imaging means to the imaging visual field of the another surveillance camera terminal, that is stored in the imaging visual field storage means.