1. A neuron device ( 101 ) for simulating a nerve cell comprising: a threshold storage unit ( 102 ) storing a threshold variable θ and two threshold coefficients Δθ 1 and Δθ 2 ; an input reception unit ( 103 ) receiving one or multiple input signal values at predetermined time intervals; an output unit ( 104 ) outputting, as an output signal value, a value “1” for indicating that the neuron device ( 101 ) is firing when the sum total s of received input signal values is equal to or greater than the value of said stored threshold variable θ, and otherwise a value “0” for indicating that the neuron device ( 101 ) is resting; and a threshold updating unit ( 105 ) calculating: 
 Δθ1X+Δθ2(X−1) using said output signal value X and said stored threshold coefficients Δθ 1 and Δθ 2 , and updating the value of the threshold variable θ stored in said threshold storage unit ( 102 ) by increasing it by the calculation result.