A control system includes: a specifying part for specifying a model corresponding to a processing apparatus and a control algorithm that generates a control signal for controlling the processing apparatus; a simulator for simulating the state of the processing apparatus with the model; a first control signal generation part for generating a control signal based on the measurement value by using the control algorithm; a second control signal generation part for generating a control signal based on an output value of the simulator by using the control algorithm; a first adjustment part for adjusting a value of a model parameter included in the model; and a second adjustment part for adjusting a value of a control parameter included in the control algorithm so that an evaluation value calculated for the output value of the simulator becomes closer to a target value.