Abstract: A simulation device configured to perform a simulation based on a digital twin service includes a creation unit configured to create a simulation model based on model design data; an identification unit configured to identify at least one intrinsic parameter of the created simulation model and at least one input value related to the intrinsic parameter; an output unit configured to output an estimated output value which is produced from the simulation model depending on the input value based on the intrinsic parameter; a correlation analysis unit configured to analyze a correlation between the intrinsic parameter and the estimated output value; a selection unit configured to select at least one representative intrinsic parameter from among the at least one intrinsic parameter depending on the analyzed correlation; a collection unit configured to collect real sensor data related to the representative intrinsic parameter from a real model constructed based on the model design data; an update unit configured to