An information processing system includes a plurality of functional blocks (neurons) (100) and a data bus (300) for transmitting in common the outputs of the individual functional blocks (neurons). Data transaction among the functional blocks (neurons) is performed through the data bus on the time-division basis. For preventing the outputs from conflicting or competition, addresses are assigned to the individual blocks (neurons), respectively, so that only the functional block (neuron) having the own address designated by the address signal supplied through an address bus (302) outputs data signal onto the data bus, while the other functional blocks (neurons) receive the information on the data bus as the signal originating in the functional block whose address is designated at that time point. The addresses are sequentially changed. During a round of the addresses signals, data are transmitted from given functional blocks (neurons) to other given functional blocks (neurons).