A quantum circuit design method implemented by a computer, the method comprising:
- detecting a first quantum gate of which a gate operation is not performed by a quantum device, from a quantum circuit that indicates a gate operation on a plurality of qubits included in the quantum device;
- determining an equivalent circuit to be mounted, from among a plurality of equivalent circuits that implements a gate operation same as the first quantum gate by a second quantum gate of which a gate operation is performed by the quantum device, based on a relaxation time of a qubit to be operated by the detected first quantum gate;
- and
- converting the first quantum gate in the quantum circuit into the determined equivalent circuit.