A method for generating virtual teeth, comprising: (a) acquiring a tooth image having three-dimensional information from teeth including a damaged tooth; (b) determining an image (205; 410) of a virtual tooth to be inserted into a position of the damaged tooth in a tooth image library having predetermined three-dimensional information and inserting the determined virtual tooth image (205; 410) into the acquired tooth image; and (c) modifying the virtual tooth image (205; 410) by considering tooth images positioned at upper and lower sides or right and left sides of the virtual tooth image, wherein the step (c) includes: (ca) modifying a height of the virtual tooth image (205; 410) by considering an occlusion point between the virtual tooth image (205; 410) and a first tooth image positioned above and below the virtual tooth image (205; 410), or (ca') modifying a width of the virtual tooth image (205; 410) so as not to be larger than a first guide line that links a bulge portion at sides of a second tooth image positioned at right and left sides of the virtual tooth image (205; 410) with the virtual tooth image (205; 410), the method being characterized by (cb) positioning at least one tooth group image of a first tooth group image including the virtual tooth image (205; 410) and the first tooth image and a second tooth group image including the virtual tooth image (205; 410) and the second tooth image in a virtual articulator; and (cc) modifying the virtual tooth image (205; 410) by removing a cusp or a ridge of the virtual tooth image (205; 410) that interferes with an implant image in the tooth group image positioned in the virtual articulator, wherein in the step (cb), a head part image is acquired from a target person who wants to restore his/her teeth, the tooth group image is inserted into the acquired head part image, and the tooth group image is positioned in the virtual articulator, and wherein positioning the head part image inserted with the tooth group image in the virtual articulator in the step (cb) is performed by using at least one point of a first point formed at a temporomandibular joint extracted from a head part photographing image including an oral maxillo face photographed by using at least one device of a radiation exposing device, a magnetic resonance imaging device, and a positron tomography device, an incisal point, and a second point formed on a Frankfort line that connects an inferior orbit rim and a superior auditory meatus with each other as a reference point. (a) acquiring a tooth image having three-dimensional information from teeth including a damaged tooth; (b) determining an image (205; 410) of a virtual tooth to be inserted into a position of the damaged tooth in a tooth image library having predetermined three-dimensional information and inserting the determined virtual tooth image (205; 410) into the acquired tooth image; and (c) modifying the virtual tooth image (205; 410) by considering tooth images positioned at upper and lower sides or right and left sides of the virtual tooth image, (ca) modifying a height of the virtual tooth image (205; 410) by considering an occlusion point between the virtual tooth image (205; 410) and a first tooth image positioned above and below the virtual tooth image (205; 410), or (ca') modifying a width of the virtual tooth image (205; 410) so as not to be larger than a first guide line that links a bulge portion at sides of a second tooth image positioned at right and left sides of the virtual tooth image (205; 410) with the virtual tooth image (205; 410), the method being characterized by (cb) positioning at least one tooth group image of a first tooth group image including the virtual tooth image (205; 410) and the first tooth image and a second tooth group image including the virtual tooth image (205; 410) and the second tooth image in a virtual articulator; and (cc) modifying the virtual tooth image (205; 410) by removing a cusp or a ridge of the virtual tooth image (205; 410) that interferes with an implant image in the tooth group image positioned in the virtual articulator,