A database creation method relating to semiconductor ICs, the database registering function block cells constituting a design data of semiconductor IC and evaluation values corresponding to the function block cells such that the function block cells are associated with the evaluation values, for each of the semiconductor ICs, the creation method includes judging whether or not that function block cells constituting a design data of desired semiconductor IC include an unregistered function block cell which is not registered in the database, calculating an unregistered evaluation value corresponding to the unregistered function block cell when the function block cells constituting the design data of the desired semiconductor IC are judged to include the unregistered function block cell, and updating the database by registering the unregistered function block cell and the unregistered evaluation value such that the unregistered function block cell is associated with the unregistered evaluation value.