PURPOSE: To attain a subroutine action SL and a recurrent action with a data flow type machine and at the same time to decrease the hardware quantity of a bus with omission of an extension identifier, by storing previously a data identifier in a stack type memory.

CONSTITUTION: This subroutine modulus for a machine having a data flow type architecture is provided with a parameter memory 2 which switches the input and output actions according to an input fluctuation identifier and delivers the parameter value and an internal identifier with the fluctuation identifier used as an address, a numerical data processing part, a stack memory 6 which holds temporarily the internal identifier, a pointer memory 5 which stores the address of the memory 6, an identifier memory 3 which supplies the internal identifier as an address and delivers the next fluctuation identifier and the data on the destination, and a destination memory 4. Then each output is connected to a bus from a selector.