A survey data processing apparatus comprising: a ground control point position data obtaining part which obtains information of arrangement positions of multiple reflection prisms of which arrangement positions are known; a laser scanner approximate position data obtaining part which obtains an approximate position of a laser scanner; and a laser scanning data obtaining part which obtains data of multiple luminescent points and direction of each multiple luminescent point viewed from the laser scanner as laser scanning data by laser scanning by the laser scanner in a range containing the multiple reflection prisms; characterized in further comprising: an overflow point extracting part which extracts multiple luminescent points having luminance exceeding a specific threshold value among multiple luminescent points; a processing object point extracting part which extracts multiple luminescent points in the same number as the multiple reflection prisms from among the extracted multiple luminescent points; and a laser scanner position calculating part which gives information of the arrangement position of the reflection prism to each of the multiple luminescent points that are extracted by the processing object point extracting part, so as to calculate a position of the laser scanner which performs the laser scanning as a provisionally calculated position by the backward intersection method, wherein the approximate position of the laser scanner is obtained by position determination using a Wi-Fi device, by position determination using a GNSS position measuring device, or by reading from drawing data, in a condition in which a difference between the approximate position and the provisionally calculated position is not more than a threshold value or is the minimum, the multiple luminescent points that are extracted by the processing object point extracting part are specified as luminescent points of the multiple reflection prisms. a ground control point position data obtaining part which obtains information of arrangement positions of multiple reflection prisms of which arrangement positions are known; a laser scanner approximate position data obtaining part which obtains an approximate position of a laser scanner; and a laser scanning data obtaining part which obtains data of multiple luminescent points and direction of each multiple luminescent point viewed from the laser scanner as laser scanning data by laser scanning by the laser scanner in a range containing the multiple reflection prisms; characterized in further comprising: an overflow point extracting part which extracts multiple luminescent points having luminance exceeding a specific threshold value among multiple luminescent points; a processing object point extracting part which extracts multiple luminescent points in the same number as the multiple reflection prisms from among the extracted multiple luminescent points; and a laser scanner position calculating part which gives information of the arrangement position of the reflection prism to each of the multiple luminescent points that are extracted by the processing object point extracting part, so as to calculate a position of the laser scanner which performs the laser scanning as a provisionally calculated position by the backward intersection method, wherein the approximate position of the laser scanner is obtained by position determination using a Wi-Fi device, by position determination using a GNSS position measuring device, or by reading from drawing data, in a condition in which a difference between the approximate position and the provisionally calculated position is not more than a threshold value or is the minimum, the multiple luminescent points that are extracted by the processing object point extracting part are specified as luminescent points of the multiple reflection prisms. an overflow point extracting part which extracts multiple luminescent points having luminance exceeding a specific threshold value among multiple luminescent points; a processing object point extracting part which extracts multiple luminescent points in the same number as the multiple reflection prisms from among the extracted multiple luminescent points; and a laser scanner position calculating part which gives information of the arrangement position of the reflection prism to each of the multiple luminescent points that are extracted by the processing object point extracting part, so as to calculate a position of the laser scanner which performs the laser scanning as a provisionally calculated position by the backward intersection method, wherein the approximate position of the laser scanner is obtained by position determination using a Wi-Fi device, by position determination using a GNSS position measuring device, or by reading from drawing data, in a condition in which a difference between the approximate position and the provisionally calculated position is not more than a threshold value or is the minimum, the multiple luminescent points that are extracted by the processing object point extracting part are specified as luminescent points of the multiple reflection prisms.