A disparity deriving apparatus for deriving disparity of an object includes a calculator to calculate costs between a first reference area in a reference image and each one of corresponding areas corresponding to the first reference area in the comparison image, and costs between a second reference area, surrounding the first reference area in the reference image, and each one of corresponding areas corresponding to the second reference area in a comparison image; a synthesizer to synthesize the costs of the first reference area and the second reference area as synthesis costs; a deriving unit to derive a disparity value of the object captured in the first reference area based on the synthesized synthesis costs; and a correction unit to apply a spatial filter to a local region, composed of a plurality of areas, in the first reference image to correct a disparity value of the local region.