1. A learning system comprising: a layered neural network which includes an input layer, at least one hidden layer, and an output layer; rate of change calculating means connected to receive input data for calculating the rate of change of said input data by dividing a difference between two input data by one of said two input data and outputting calculated rate of change data; and network generating means connected to receive said input data and to receive said calculated rate of change data from said rate of change calculating means, for controlling learning processes performed through said layered neural network by applying said input data and said calculated rate of change data as learning data to said neural network, and for establishing a layered neural network, a weight value of said layered neural network being determined for said learning data.