1. A numerical arithmetic processing unit comprising: storage means for storing numeric data; and set means for reading a numeric data from said storage means; and setting processing to be executed subsequently to the reading of the numeric data from said storage means in accordance with a numeric value of said numeric data being read each said numeric data including a numeric part onsisting of a numeral data and a numeric code part including a code specifying whether the numeric data is data to be arithmetically processed or data indicating processing to be executed subsequently, said code including said numeric value.