An apparatus that enables measurement of distances to a plurality of planes of an object and plane directions thereof, includes one or more processors that execute instructions to acquire an image of the object on which a projection pattern is projected, the projection pattern being formed by arranging a plurality of line sets at intervals longer than a predetermined value, each of the plurality of line sets having lines arranged at intervals shorter than the predetermined value, detect the lines in the projection pattern from the image, determine the line sets from the detected lines, calculate a distance from a predetermined reference coordinate to a position on a plane of the measurement target object on which a detected line is projected, and calculate a plane direction of a plane of the object on which the line sets are projected, based on the calculated distance.