PURPOSE: To provide an information processor using a neural net in which plural partial networks are connected systematically, and association precision can be improved.

CONSTITUTION: This information processor is the information processor using a neural net to obtain an output signal corresponding to an input signal by giving the neural net the input signal of a processed object, and a whole network is constituted of plural partial networks 10, 11, and each partial network 10, 11 is made to operate interactively because it has circulating type hierarchical structure in which the output signal of an output layer is returned to an input layer, and simultaneously, a part or the whole of each layer is shared by each other. Thus, the precision of association can be improved.