Surveying system

A surveying system comprises an electronic level (1) and staff devices (2, 21) belonging to one of two or more groups. The staff devices (2, 21) have staffs (2a, 2b) with bar codes corresponding to groups, to which a staff belongs, and mobile station devices (21a, 21b) installed on the staffs. The mobile station device (21a, 21b) has a mobile station display unit (25) to display working data and a mobile station communication unit (26) for performing wireless communication to and from the electronic level (1). The electronic level (1) has an image pickup unit (7) for acquiring images within a range of working, a control device (8) for extracting staff images from the images, for identifying to which group the bar code pattern of the extracted staff image belongs and for determining the three-dimensional position of the staffs (2a, 2b) based on the staff image, and a main communication unit (10) for transmitting the three-dimensional position obtained to the mobile station device (21a, 21b). The mobile station device (21a, 21b) displays the relationship between the three-dimensional position of the staff as received and the working data on the mobile station display unit (25).