Coordinates on a two-dimensional image that respectively correspond to points on a three-dimensional space that configures an object included in a field of view based on a viewpoint are specified. A depth map is generated based on a result of assignment processing that assigns distance information of a first point corresponding to first coordinates to a first area including the first coordinates and assigns distance information of a second point corresponding to second coordinates to a second area including the second coordinates, the first and second coordinates belonging to coordinates on the two-dimensional image. A distance from the viewpoint to the first point is longer than a distance from the viewpoint to the second point, and the first area is smaller than the second area. The points configuring the object include the first and second points.