A device for generating data on a clear aligner, the device comprising: a database configured to store and manage alignment data including pre-amendment and post-amendment contour data and guide information, a dental-data and aligner data management program configured to provide interfaces for functions of units and modules of the device, an aligner data generation module configured to generate 3D data relating to the clear aligner based on 3D data that contains data on a current arrangement of patient's teeth and on a gingival internal structure, characterized in that the aligner data generation module includes; a first module that receives data on a current dental state from a scanning apparatus that scans patient's teeth; a second module that generates 3D data on a state of the patient's teeth and of the vicinity of the patient's teeth based on data that results from the scanning; a third module that generates data relating to a 3D clear aligner with a predetermined thickness; a fourth module that changes at least one of a shape and a feature of the 3D clear aligner, and processes the data relating to the 3D clear aligner, a fifth module that transmits the processed data on the 3D clear aligner to an aligner manufacturing apparatus, wherein the fourth module forms a groove portion having an opening in one portion of the 3D clear aligner and forms a button member onto which an elastic member passing through the groove and applying pressure to a tooth is locked on the 3D clear aligner, in such a manner that the tooth is gradually moved into a gingiva or is gradually moved out of the gingiva, wherein the third module is configured to adjust a thickness attribute among attributes of the data on the 3D clear aligner, the thickness having a type selected from soft-type, medium-type and hard-type such that an amount of alignment is determined and adjusted in a case where the patient wears the 3D clear aligner, wherein the third module is further configured to individually adjust thicknesses of the 3D clear aligner, which correspond to respective teeth that are expressed in the 3D dental data to allow movement of the respective teeth with different amounts of movement in a uniform manner. a database configured to store and manage alignment data including pre-amendment and post-amendment contour data and guide information, a dental-data and aligner data management program configured to provide interfaces for functions of units and modules of the device, an aligner data generation module configured to generate 3D data relating to the clear aligner based on 3D data that contains data on a current arrangement of patient's teeth and on a gingival internal structure, characterized in that the aligner data generation module includes; a first module that receives data on a current dental state from a scanning apparatus that scans patient's teeth; a second module that generates 3D data on a state of the patient's teeth and of the vicinity of the patient's teeth based on data that results from the scanning; a third module that generates data relating to a 3D clear aligner with a predetermined thickness; a fourth module that changes at least one of a shape and a feature of the 3D clear aligner, and processes the data relating to the 3D clear aligner, a fifth module that transmits the processed data on the 3D clear aligner to an aligner manufacturing apparatus, wherein the fourth module forms a groove portion having an opening in one portion of the 3D clear aligner and forms a button member onto which an elastic member passing through the groove and applying pressure to a tooth is locked on the 3D clear aligner, in such a manner that the tooth is gradually moved into a gingiva or is gradually moved out of the gingiva, wherein the third module is configured to adjust a thickness attribute among attributes of the data on the 3D clear aligner, the thickness having a type selected from soft-type, medium-type and hard-type such that an amount of alignment is determined and adjusted in a case where the patient wears the 3D clear aligner, wherein the third module is further configured to individually adjust thicknesses of the 3D clear aligner, which correspond to respective teeth that are expressed in the 3D dental data to allow movement of the respective teeth with different amounts of movement in a uniform manner.