A management system comprising: a measuring device (2,6) including a communication unit (20,61) and a coordinate measuring unit (11,12,19,62) for acquiring three-dimensional coordinates of a target; an eyewear device including a communication unit, a display, a relative position detection sensor configured to detect a position of the eyewear device, and a relative direction detection sensor configured to detect a direction that the eyewear device faces; a storage unit (36,17,53) configured to store CAD design data of a management site; and an arithmetic processing unit (30,18,52) including a synchronous measuring unit configured to receive information on a position and a direction of the measuring device (2,6) and information on a position and a direction of the eyewear device, and synchronize a coordinate space of the measuring device (2,6), a coordinate space of the eyewear device, and a coordinate space of the CAD design data, characterized in that the synchronous measuring unit acquires information of a wire frame viewed from a point at the position in the direction of the eyewear device from the CAD design data, the eyewear device displays the information of the wire frame that the eyewear device received on the display by superimposing the information on an actual construction product, the synchronous measuring unit calculates, as difference information, a difference from a measurement point designated by an administrator on the CAD design data to a coordinate point of the target set corresponding to the measurement point by the administrator, and the eyewear device displays a numerical value of the difference information that the eyewear device received on the display. a measuring device (2,6) including a communication unit (20,61) and a coordinate measuring unit (11,12,19,62) for acquiring three-dimensional coordinates of a target; an eyewear device including a communication unit, a display, a relative position detection sensor configured to detect a position of the eyewear device, and a relative direction detection sensor configured to detect a direction that the eyewear device faces; a storage unit (36,17,53) configured to store CAD design data of a management site; and an arithmetic processing unit (30,18,52) including a synchronous measuring unit configured to receive information on a position and a direction of the measuring device (2,6) and information on a position and a direction of the eyewear device, and synchronize a coordinate space of the measuring device (2,6), a coordinate space of the eyewear device, and a coordinate space of the CAD design data, characterized in that the synchronous measuring unit acquires information of a wire frame viewed from a point at the position in the direction of the eyewear device from the CAD design data, the eyewear device displays the information of the wire frame that the eyewear device received on the display by superimposing the information on an actual construction product, the synchronous measuring unit calculates, as difference information, a difference from a measurement point designated by an administrator on the CAD design data to a coordinate point of the target set corresponding to the measurement point by the administrator, and the eyewear device displays a numerical value of the difference information that the eyewear device received on the display.