An output control method according to an embodiment is to control an output by a deflection amplifier that outputs a voltage signal to a deflection electrode of an electron beam writing apparatus. The voltage signal is proportional to input data, and the method includes: performing, for the voltage signal generated by synthesizing respective outputs by a plurality of D/A converters to which a control range of the voltage signal is assigned, the respective outputs by the plurality of D/A converters being proportional to respective inputs, sampling on at least either a lower limit value of the voltage signal within the control range or an upper limit value thereof; and generating a correction value to correct the output by the D/A converter based on the sampling result.