Logic emulation system

A logic emulation system that verifies a target logic circuit and evaluates its performance efficiently divides the design data of a target logic circuit into a plurality of small-scale logic circuits and a connection circuit for interconnecting the small-scale logic circuits, thereby creating an equivalent circuit of the target logic circuit. The logic emulation system judges, when a logical design change to the target logic circuit prompts the comparison of the data of the equivalent circuit of the logic circuit before the logical change with the data after the logical change, whether it is feasible to implement the design data on the logically changed logic circuit by adding one or more small-scale logic circuits, and by altering the connection circuit accordingly. When the implementation of the design data on the logically changed logic circuit is judged to be feasible, the equivalent circuit of the logically changed logic circuit is generated by resorting to the above measures and without modifying the existing equivalent circuit.