An information-linkage supporting apparatus includes: a schema-information acquiring unit acquiring schema information concerning the configuration of numerical control data stored by a numerical-control-data storing apparatus as a database, from the numerical-control-data storing apparatus; a memory-map-information acquiring unit acquiring memory map information concerning memory allocation in the data memory of the numerical control data stored by a numerical control apparatus in an inside thereof, from the numerical control apparatus; a mapping-table generating unit generating, on the basis of association instruction information inputted from the outside for instructing association between constituent elements of the schema information and constituent elements of the memory map information, a mapping table, which is information for information linkage obtained by associating and mapping the constituent elements of the schema information and the constituent elements of the memory map information; and a mapping-table transmitting unit transmitting the mapping table to the numerical control apparatus.