1. A surveillance camera apparatus comprising: a wide-angle camera that converts an optical image obtained through a wide-angle lens into a first image signal, the wide-angle camera that outputs the first image signal, an optical axis of the wide-angle camera being fixed in a constant direction; a telephotographic camera that converts an optical image obtained through a telephotographic lens into a second image signal, the telephotographic camera that outputs the second image signal, the telephotographic camera supported to be rotatable around at least one pivot axis so that an optical axis of the telephotographic camera can be tilted; a directivity information calculating unit that identifies an image of a moving object within a image-capturing range of the wide-angle camera based on the first image signal from the wide-angle camera, the directivity information calculating unit that calculates directivity information corresponding to a position of the image of the moving object within the image-capturing range; a camera posture control unit that rotates the telephotographic camera around the pivot axis in accordance with the directivity information so as to direct the optical axis of the telephotographic camera at the moving object captured by the wide-angle camera; and a tracking information calculating unit that calculates tracking information, which is used to direct the optical axis of the telephotographic camera so as to place the image of the moving object at a center of a image-capturing range of the telephotographic camera, based on second image signals sequentially output from the telephotographic camera, wherein: after the tracking information is calculated, the camera posture control unit is controlled in real time using the tracking information in place of the directivity information and the telephotographic camera continuously captures the moving object.