PURPOSE: To simultaneously regenerate the working of a single master personal computer through plural slave personal computers by securing such a constitution where those slave personal computers are connected to the master one via a connection mechanism.

CONSTITUTION: The key information supplied from a master station (personal computer) 1 is read by a built-in keyboard controller 12 and at the same time transmitted to a slave station (personal computer) 2 via a built-in interface unit 14. The station 2 receives the key information via a connection mechanism 3 and a built-in interface unit 24 and recognizes it via the built-in software. Furthermore the station 2 accepts the key information from its own keyboard unit 22. Thus the key information produced by the station 1 is processed by the software of the station 1 itself and at the same time recognized by the software of the station 2 to undergo the same processing as the station 1. In addition, the working (screen display, etc.) of a single master station can be simultaneously regenerated by plural slave stations with connection of these slave stations to the mechanism 3.