PURPOSE: To keep maintainability and reliability of an electronic exchange and enable to change necessary audible sound data simply by writing the desired audible sound data from a semipermanent external storing device to an internal storing circuit.

CONSTITUTION: A CPU 32 reads out data of a floppy disk device 35 and stores in the RAM of a main memory 33. The CPU 32 controls a controller 36 by a controlling program, stores audible sound data in the memory 33 in an audible sound data storing circuit 42 through a controller 41. The CPU 32 transfers the audible sound data of the storing circuit 42 to a time switch 43 at desired time, and sends out the audible sound to a telephone set.