Method for suppressing a voltage fluctuation applying to a load by a second power section with the same or opposite voltage polarity

An electronic apparatus comprising:

• a processing device that processes data;
• and
• a power supply device that includes:
• a detection section;
• a first supply section that supplies power in accordance with an extent of a load in processing in a processing device, which processes data, by applying a voltage to the processing device in accordance with an error between an average value of the voltage applied to the processing device and detected by the detection section and a predetermined reference value;
• and
• a second supply section that supplies, to the processing device, power smaller than the supplying power by the first supply section, in accordance with an extent of a load in processing in the processing device to increase and decrease a voltage with respect to the application voltage by the first supply section in accordance with an error between a voltage applied to the processing device and detected by the detection section and the predetermined reference value.