A method for analyzing a 3D oral model, the method comprising: displaying a 3D oral model as an oral image; displaying a reference index together with the oral image; setting the reference index in the oral image; acquiring oral information by analyzing the oral image on the basis of the set reference index; and designing a virtual prosthesis on the basis of the oral information, wherein the reference index includes at least one of a lingual archline, a buccal archline, a main archline, a mesial boundary, and a distal boundary, the setting of the reference index in the oral image includes: providing a manual interface that moves a shape and a position of the oral image; and providing a manual interface that moves a shape and a position of the reference index, the acquiring of oral information includes acquiring a prosthesis design parameter by analyzing the oral image aligned in accordance with the manual interfaces on the basis of the reference index, and designing the virtual prosthesis on the basis of the prosthesis design parameter, characterized by the fact that the reference index is set to a first standard archline, a second standard archline and a third standard archline that are designed by statistically reflecting shapes of archlines of people, the displaying a reference index together with the oral image includes: extracting the shape of a set of teeth from the oral image, and automatically selecting and displaying one of the first to the third standard archlines, wherein the selected standard archline is the most similar to the shape of the set of teeth extracted from the oral image. displaying a 3D oral model as an oral image; displaying a reference index together with the oral image; setting the reference index in the oral image; acquiring oral information by analyzing the oral image on the basis of the set reference index; and designing a virtual prosthesis on the basis of the oral information, wherein the reference index includes at least one of a lingual archline, a buccal archline, a main archline, a mesial boundary, and a distal boundary, the setting of the reference index in the oral image includes: providing a manual interface that moves a shape and a position of the oral image; and providing a manual interface that moves a shape and a position of the reference index, the acquiring of oral information includes acquiring a prosthesis design parameter by analyzing the oral image aligned in accordance with the manual interfaces on the basis of the reference index, and designing the virtual prosthesis on the basis of the prosthesis design parameter, characterized by the fact that the reference index is set to a first standard archline, a second standard archline and a third standard archline that are designed by statistically reflecting shapes of archlines of people, the displaying a reference index together with the oral image includes: extracting the shape of a set of teeth from the oral image, and automatically selecting and displaying one of the first to the third standard archlines, wherein the selected standard archline is the most similar to the shape of the set of teeth extracted from the oral image. providing a manual interface that moves a shape and a position of the oral image; and providing a manual interface that moves a shape and a position of the reference index, the acquiring of oral information includes acquiring a prosthesis design parameter by analyzing the oral image aligned in accordance with the manual interfaces on the basis of the reference index, and designing the virtual prosthesis on the basis of the prosthesis design parameter, characterized by the fact that the reference index is set to a first standard archline, a second standard archline and a third standard archline that are designed by statistically reflecting shapes of archlines of people, the displaying a reference index together with the oral image includes: extracting the shape of a set of teeth from the oral image, and automatically selecting and displaying one of the first to the third standard archlines, wherein the selected standard archline is the most similar to the shape of the set of teeth extracted from the oral image. extracting the shape of a set of teeth from the oral image, and automatically selecting and displaying one of the first to the third standard archlines, wherein the selected standard archline is the most similar to the shape of the set of teeth extracted from the oral image.