A current programming apparatus includes a current source; a plurality of first circuits to which data currents are supplied through a data line, the first circuits commonly connected with the data line; a second circuit having a terminal connected to the current source; a switch connecting or breaking the second circuit with or from the data line, wherein the current source generates a predetermined current to supply the generated current to the second circuit through the terminal while the switch is off, whereby the value of the predetermined current is written in the second circuit, and wherein the current source generates a current based on data, and the second circuit generates a current based on the written value of the predetermined current, and a difference current between the current generated by the current source and the current generated by second circuit is supplied to the first circuits through the data line while the switch is on, whereby the value of the current is written in the first circuits as the value of the data current. The influence of parasitic capacitance of the data line can be suppressed to stabilize the writing operation of the current.