Abstract: In a method of measuring convergence of a CRT and apparatus in use for implementing the same, the convergence can be adjusted more easily by measuring misconvergence using dot patterns so as to minimize the influence of position control, graphically processing the amount of the measured misconvergence and displaying the misconvergence state. It is not necessary to control precisely the relative position of a target CRT for measurement of convergence and the cameras used for measurement. Therefore, in measuring the convergence of a CRT, on each measurement of convergence of a new CRT, the operator does not need to readjust the relative position of a target CRT for measurement of convergence with respect to the cameras used for the measurement.