PURPOSE: To improve the efficiency program size of instructions at the time of continuously executing plural processing programs.

CONSTITUTION: This method is characterized by being provided with a table storage means 2, a search means 5, and an execution address calculating means 7 and continuously executing the processing programs based on calculated table address values. The table which is arranged by attaching table address values indicating the storing positions of the respective processing program address values to each processing program address value indicating the respective storing positions for plural processing programs is stored in the table storage means 2, and the search means 5 obtains the processing number indicating the position where bit data of a prescribed value exists in processing program selecting data at the time of fetching a multi-module call instruction, and the execution address calculating means 7 holds the storage address of the instruction executed at present till the end of the processing number obtaining operation for all bit data of processing program selecting data and repeatedly calculates the table address value at each time of obtaining the processing number.