According to one embodiment, a simulation apparatus includes a hardware model execution unit that executes a hardware model, a software model execution unit that executes a software model, a simulation time management unit that sets a first simulation time indicating a total elapsed time of a simulation time of the hardware model, ahead by the simulation time of which the HW model notified, and sets the second simulation time indicating a total elapsed time of a simulation time of the software model, ahead by the simulation time of which the SW model notified, and a scheduler that compares the first simulation time with the second simulation time, causes the SW model or the HW model to be executed based on the comparison result, and causes only the hardware model to be executed instead of execution of an idle loop when the SW model awaits an interrupt from the HW model.