1. A program, which refers to a first data schema and a second data schema that describe data structures to correlate a data item name constituting the first data schema with a data item name constituting the second data schema, the program controlling a computer to execute the procedures of: extracting the data item name constituting the first data schema; extracting the data item name constituting the second data schema; extracting element concepts included in the extracted data item names of the first data schema and the second data schema; setting a distinctive relation between the data item names based on the extracted element concepts; reading the data item names of the first data schema and the second data schema and setting a correlation between the two read data item names based on the distinctive relation; and accumulating the correlation of the data item names.