A computer-executable circuit simulation program for executing a simulation of an operation of an analog-digital hybrid circuit having an analog circuit and a digital circuit, the simulation comprising the steps of:
- simulating the analog circuit;
- simulating the digital circuit;
- and
- controlling timing of executing the step of simulating the digital circuit according to change of a level of at least one of a predetermined signal that is input to the analog circuit and a predetermined signal that is input to the digital circuit.