Camera surveillance system and method for displaying multiple zoom levels of an image on different portions of a display

Positional and elevation data obtained from a camera unit is correlated with coordinates in an entire image display portion, used as a GUI having positional information to select a specified image with a mouse. Which frame this corresponds to in the entire image is calculated, and further, the position within the clicked frame is calculated. The calculated positional information is converted into positional information and elevation data of the frame. The camera unit is controlled with the positional information and elevation data from the camera unit, and an image of a range indicated by a specified image display frame superimposed on the display portion is taken, and stored and/or displayed. This allows confirmation an image of a range to be photographed beforehand, and the user can tell the relation between the range capable of acquiring images and the photography range at a glance, so desired portions can be continuously monitored.