PURPOSE: To execute a specified function by times division without halting other processing sequence for many hours, by executing a unit operation of the specified function by an interruption which is generated repeatedly.

CONSTITUTION: An information processing device is provided with a main storage device 1, a main storage device controlling circuit 2, an executing unit 3, a control storage 4, a sequence controlling circuit 5, an interruption controlling circuit 6, a counting circuit 7 and a data bus 100. A data and a machine instruction program are stored in the main storage device 1, and the data is processed by the executing unit 3 as prescribed by a machine instruction. When an interruption request is given repeatedly to the interruption controlling circuit 6, a unit operation of a specified function is executed by the executing unit 3.