A surveying system for acquiring three-dimensional point cloud data, the surveying system including an information processing device and a surveying device, the surveying system comprising: a scanner unit on the surveying device (200, 420), the scanner unit configured to perform a measurement to acquire the three-dimensional point cloud data; a measurement position specifying unit configured to specify a measurement position for which the three-dimensional point cloud data needs to be acquired; a position acquisition unit configured to acquire a self-position of the surveying device; and a measurement computing unit configured to perform a computation to measure the measurement position from the self-position, characterised by a surveying information acquisition unit configured to acquire, from the surveying device, surveying information including the three-dimensional point cloud data associated with position information; an area setting unit configured to set a point cloud amount management area; a segment setting unit configured to divide the management area into predetermined unit segments; a point cloud amount calculation unit configured to calculate a point cloud amount in a space of each of the unit segments; and a point cloud management unit configured to detect a segment where the point cloud amount is less than a predetermined necessary point cloud amount among the segments of the management area, wherein: the measurement position specifying unit is configured to specify, as the measurement position, a segment determined by the point cloud management unit as a segment where the point cloud amount is insufficient, the measurement computing unit is configured to compute, from a relationship between a current self-position of the surveying device acquired by the position acquisition unit and the measurement position specified by the measurement position specifying unit, how an attitude and a deflection direction of the surveying device are to be changed by drive of the surveying device itself, and based on the computation results of the measurement computing unit, the surveying device is driven and the scanner unit is deflected, and the three-dimensional point cloud data for the measurement position specified by the measurement position specifying unit is acquired. a scanner unit on the surveying device (200, 420), the scanner unit configured to perform a measurement to acquire the three-dimensional point cloud data; a measurement position specifying unit configured to specify a measurement position for which the three-dimensional point cloud data needs to be acquired; a position acquisition unit configured to acquire a self-position of the surveying device; and a measurement computing unit configured to perform a computation to measure the measurement position from the self-position, characterised by a surveying information acquisition unit configured to acquire, from the surveying device, surveying information including the three-dimensional point cloud data associated with position information; an area setting unit configured to set a point cloud amount management area; a segment setting unit configured to divide the management area into predetermined unit segments; a point cloud amount calculation unit configured to calculate a point cloud amount in a space of each of the unit segments; and a point cloud management unit configured to detect a segment where the point cloud amount is less than a predetermined necessary point cloud amount among the segments of the management area, wherein: the measurement position specifying unit is configured to specify, as the measurement position, a segment determined by the point cloud management unit as a segment where the point cloud amount is insufficient, the measurement computing unit is configured to compute, from a relationship between a current self-position of the surveying device acquired by the position acquisition unit and the measurement position specified by the measurement position specifying unit, how an attitude and a deflection direction of the surveying device are to be changed by drive of the surveying device itself, and based on the computation results of the measurement computing unit, the surveying device is driven and the scanner unit is deflected, and the three-dimensional point cloud data for the measurement position specified by the measurement position specifying unit is acquired. the measurement position specifying unit is configured to specify, as the measurement position, a segment determined by the point cloud management unit as a segment where the point cloud amount is insufficient, the measurement computing unit is configured to compute, from a relationship between a current self-position of the surveying device acquired by the position acquisition unit and the measurement position specified by the measurement position specifying unit, how an attitude and a deflection direction of the surveying device are to be changed by drive of the surveying device itself, and based on the computation results of the measurement computing unit, the surveying device is driven and the scanner unit is deflected, and the three-dimensional point cloud data for the measurement position specified by the measurement position specifying unit is acquired.