The present invention is related to electronic equipment having a controlling unit and a subordinate unit, and more particularly, to an apparatus for controlling power and signal of electronic equipment having a controlling unit and a subordinate unit which can reduce power consumption by turning off power to an unused subordinate unit at a certain period of time, and effectively reducing leakage current that flows from the controlling unit to the subordinate unit in the apparatus for extending battery usage time, and prevent distortion of waveforms of the subordinate unit's input end being sent from the controlling unit. The apparatus includes switch operation circuit unit connected to signal control line to prevent leakage current flowing toward the subordinate unit by signal level of the controlling unit being authorized to the signal control line; capacitors connected to the signal control line, that exist on the signal control line and inside of the subordinate module; and residual current element removing unit for discharging residual current charged in the capacitors, in order to prevent distortion of signals that are authorized from the controlling unit to the subordinate unit.