A method is provided for controlling display of three-dimensional data in a three-dimensional processor that processes three-dimensional data indicating three-dimensional position coordinates of each point on a surface of an object to be measured, the three-dimensional data being obtained by projecting measurement light onto the object and receiving measurement light reflected from the object. The method includes obtaining reliability data that are an index of reliability of three-dimensional data of said each point, enabling a user to adjust a threshold for defining a range of the reliability, and displaying, on a screen of a display, three-dimensional data corresponding to reliability falling within a range defined by the threshold adjusted by the user with the three-dimensional data displayed distinguishably from different three-dimensional data.