Disclosed are a terminal apparatus, a system comprising the terminal apparatus, and a method for controlling the terminal apparatus. The terminal apparatus comprises: an input unit for receiving 3D scanning information of an object; a display unit for displaying the 3D scanning information; and a control unit for detecting a defective part from the 3S scanning information, wherein if a defective part is detected, the control unit activates a repair mode, generates a repair part corresponding to the defective part on the basis of the 3D scanning information, and wherein the repair part is divided into a coupling area and a non-coupling area, and if a predetermined condition is satisfied, a separable protrusion can be formed in the non-coupling area.