An operating apparatus and operating control method of a side step of a vehicle controls the opening operation of the side step by being operated in conjunction with an operation of a vehicle door and by detecting whether an obstacle is present or not in an opening operation space of a side step of left front, left rear, right front and right rear side steps (11, 12, 13 and 14), opens the side step when it is determined that no obstacle is present in the opening operation space of the side step, and provides an alarm to a user when it is required to avoid the opening of the side step.