PURPOSE: To reduce the load of an information processor and to improve the efficiency of a multi-address transfer by setting specific identification numbers assigned to other information processors to be reception objects to an information part when the information processor transmits signals on a network.

CONSTITUTION: When an information processor transmits signals on a network 20, the identification numbers of other information processor to be reception objects are set by an identification number imparting means 1. When signals are received from the network 20 in other information processors, the identification numbers are extracted from an information part added to the signals by an identification number extraction means 2. The identification numbers extracted by the means 2 are delivered to a decision means 3 and are compared with the self identification number. When the identification numbers coinciding with the self identification number are found, reception signals are fetched via a selection means 4 and when the number are not found, the reception signals are abolished. Thus, the signal transfer can be efficiently performed according to the specific group of the information processors.