Apparatus (100) for generating dental data for manufacturing an aligner, the apparatus including: a dental-data generation unit (30), in which the dental-data generation unit (30) includes a first module (31) that receives data on a current state of the teeth of the patient from a scanner, a second module (32) that generates a state of the teeth of the patient and the vicinity of the teeth as 3D data, based on the data received from the scanner, a third module (33) that sets a central point (322a, 352a) for dental movement in the 3D data, a fourth module (34) that sets each central reference for a crown (301), a buccal surface, and a lingual surface of the tooth in the 3D data, and a fifth module (35) that sets a reference for a dental root point in the 3D data.