1. A control method for controlling a control object by means of a neuro controller made up of a recurrent neural network, said control method comprising the steps of: connecting said neuro controller in parallel to a control unit having functions for controlling said control object and connecting in parallel to said control object a neuro control-object simulator made up of a recurrent neural network for simulating said control object; operating said neural network of said neuro controller and a neural network making up said neuro control-object simulator to perform a pre-learning phase so as to make input-output relations of said neuro controller match input-output relations of said control unit, and so as to make in said pre-learning phase input-output relations of said neuro control-object simulator match input-output relations of said control object; connecting the output and the input of said neuro controller to the input and the output, respectively of said neuro control-object simulator; operating said neural network of said neuro controller to perform a re-learning phase so as to make the output of said neuro control-object simulator match the input of said neuro controller; and thereafter connecting said neuro controller to control said control object after completing said re-learning phase and thereafter controlling said control object using only said neuro controller.