Information terminal apparatus

摘要

Objects of the invention are to enable different kinds of communication apparatus (30) having interfaces of different input/output methods and different signal voltages to be connected to the same interface; to achieve communication processing appropriate to the automatically detected attribute of the communication apparatus (30); to explicitly indicate optimum communication means; and to enable communications to be automatically resumed even if the communication apparatus (30) is replaced in the middle of communication. The communication apparatus (30) comprises: means (32) for sending the connected state of the communication apparatus (30) and an attribute of the communication apparatus (30) which connected to information terminal apparatus (1); a signal line (71) for sending a connection notification to the information terminal apparatus (1); and a signal input section and a signal output section (34) for transferring control signals and data to and from the information terminal apparatus (1). <IMAGE>