An improved call distribution processing method for a called line number computation in a premium-rate service of Intelligent Network is provided. The method is capable of routing to various called numbers designated in accordance with a calling area, performing a call distribution in accordance with the capacity of a called party number, and routing to a called number since this method does not degrade call processing performance of the system. Since a system load is less, the occurrence frequency per each digit when digits from one to a hundred is performed N-times evenly occurs, and the values which was generated in the function of the random numbers does not occur in the identical pattern.