1. A robot control apparatus for monitoring a load exerted on a robot comprising: a motor having an output shaft connected to a driving mechanism of said robot; speed detection means for detecting a rotational angular speed of said motor; acceleration calculation means for determining a rotational angular acceleration of said motor based on said rotational angular speed; driving torque calculation means for calculating a driving torque outputted from said motor output shaft by determining a torque spent inside the motor using said rotational angular speed and said rotational angular acceleration, by determining a torque generated by the motor using a driving current of said motor and by subtracting said torque spent inside the motor from said torque generated by said motor; and display means for displaying said calculated driving torque.