PURPOSE: To simplify and expedite the execution by providing a building site coordinate point sampling means and an image pickup means for image pickuping a building site which can be turned in the vertical direction and in the horizontal direction by remote control, and a transmission device and a display device for the above execution information.

CONSTITUTION: A survey instrument 1 having a television camera (image pick-up means) and a range finder (coordinate point sample means) on a tripod is installed about 100-200m distant from a surveyed spot. Subsequently, after the coordinate and the azimuth are set, a range finder is operated by a keyboard in an operator's cab of a backhoe 2 to sample a coordinate point of a measured point first and transmit the coordinate point information to the backhoe 2 side through a personal computer 19 and wireless MODEMs 20, 27. Simultaneously, an image of a measured point by a television camera 7 is transmitted to the backhoe 2 side through an image transmission device 21 and a receiver 29. These two signals are processed by a personal computer 24 of the backhoe 2 side to display a composite image on CRT 25. Thus, execution information can be obtained correctly, surely and further rapidly.