There is provided an apparatus for adjusting a field angle including a pointer device that projects a pattern having a given mark shape in a direction same as a light axis of a pan-tilt-zoom camera, a calculation portion that calculates a relationship between a pixel position in an image of a wide camera and a pan angle and a tilt angle in the pan-tilt-zoom camera on the basis of a detected mark shape in the image captured by the wide camera, and an adjustment portion that adjusts the field angle of the wide camera and that of the pan-tilt-zoom camera with the use of the relationship calculated by the calculation portion.