PURPOSE: To obtain a desired area with a small number of steps and simultaneously to process data at a high speed by setting the destination for separating the desired memory area to a table and then referring to this table.

CONSTITUTION: A unit control table NT is provided prior to execution of a job, and a unit area U is secured on a memory. When the unit is desired for execution of jobs, a separation macro is delivered. Then a control region of the desired unit type is outputted via a unit type recognizing part 3, etc. in response to the type of the unit shown in said macro. The unit separating destination can be obtained by reading an idle address of the controls region. In such a way, a user can obtain a desired unit just by giving an acces to the table NT in a unit separation mode. In such a way, decreases the number of steps desired for separation and also increases the data processing speed.