PURPOSE: To systematically and flexibly retrieve stored items while utilizing hierarchical structure by generating and storing the hierarchical structure between the items based on the mutual similarity between the applied items to be stored. CONSTITUTION: This device is composed of a concept forming association memory part 11 for outputting a stable concept forming association memory signal while receiving an external input signal, category detection part 12 for classifying the stable concept forming association memory signal, plural concept succeeding associated memory parts 13i for outputting stable concept succession association memory signals while receiving the external input signal and the stable concept forming association memory signal, plural sub-category detection parts 14i for classifying the stable concept succession association memory signals, and output signal generating part 15 for generating an output signal while receiving the stable concept forming association memory signal and the stable concept succession association memory signals.
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