1. A 3-dimensional face data restoring and collating system comprising: a 2-dimension face image storage unit configured to store a plurality of 2-dimensional face images of persons; a 3-dimensional face restored shape storage unit; a 3-dimensional face shape restoring unit configured to restore a 3-dimensional face shape data from one of the plurality of 2-dimensional face images for a target one of the persons based on a 3-dimensional reference face shape data, and to store the 3-dimensional restored face shape data in said 3-dimensional face restored shape storage unit, wherein said 3-dimensional face shape restoring unit restores the 3-dimensional face shape data from the 2-dimensional face image for the target person based on a 3-dimensional measured face shape data corresponding to the 2-dimensional face image; a 3-dimensional face measured shape storage unit configured to the store 3-dimensional measured face shape data as the 3-dimensional reference face shape data; a re-restoration instructing unit configured to monitor a number of the 3-dimensional measured face shape data stored in said 3-dimensional face measured shape storage unit and a number of the 3-dimensional restored face shape data stored in said 3-dimensional face restored shape storage unit, and to instruct said 3-dimensional face shape restoring unit to perform a restoring operation to the 2-dimensional face image once again, if the number of said 3-dimensional face measured shape data when the 3-dimensional restored face shape data is obtained, is smaller than a current number of said 3-dimensional face measured shape data; and a registration data matching unit configured to monitor whether the 3-dimensional restored face shape data and 3-dimensional measured face shape data of an identical person are stored in both of said 3-dimensional face restored shape storage unit and said 3-dimensional face measured shape storage unit, and to delete the 3-dimensional restored face shape data from said 3-dimensional face restored shape storage unit when the 3-dimensional restored face shape data and 3-dimensional measured face shape data of only an identical person are stored in both of said 3-dimensional face restored shape storage unit and said 3-dimensional face measured shape storage unit.