Provided is a technology to properly display information onto a projection surface without depending on a distance image sensor, and directly project a wide range of information other than a survey setting point onto a construction site. A system includes: a projector including an inclination sensor and at least one reflector; a measuring device configured to measure a position of the reflector; a means having surface information; and a means configured for setting a distance between a projection surface onto which the surface information is projected and the measuring device in a normal direction, wherein the measuring device measures the reflector, and the surface information adjusted according to the distance in the normal direction is projected onto the projection surface.