1 a camera apparatus, comprising: a camera unit which acquires an image; a line-of-sight detection unit which detects a point of eye fixation of a user within a camera screen; an importance computation unit which determines levels of importance for respective areas of the image acquired by said camera unit in accordance with the detection by said line-of-sight detection unit; and a number-of-gray-scale-level determining unit which changes a number of gray scale levels for the respective areas of the image in response to the determination by the importance computation unit.