1. An apparatus for expandable biometric searching, the apparatus comprising: a database having a plurality of biometric data groups, each of the plurality of biometric data groups including a plurality of biometric records stored therein, each of the biometric records including at least one biometric index and biometric data associated with the at least one biometric index; and a plurality of biometric searching engines, each of the plurality of biometric searching engines comprising data group managing means connected to said plurality of biometric data groups for managing the plurality of data groups, said data group managing means including multi-dimensional search space constructing means for constructing a multi-dimensional search space and internal map constructing means for constructing internal maps for each data group being managed.