Patent ID: 6871239

Claim:
An electronic equipment communication system comprising electronic equipment and an external device that is connected to the electronic equipment, and by which communication takes place there between them, wherein said external device includes: a program recording unit in which a control program that controls the external device is recorded, and a program output unit that outputs the control program recorded in said program recording unit to said electronic equipment in response to a request from said electronic equipment connected to said external device, a first authentication means that, when connected to said electronic equipment, outputs prior to the output of said control program a first identification signal of said external device and a second identification signal that is an encoded version of said first identification signal, wherein said electronic equipment, using a second authentication means, compares and verifies whether the first and second identification signals match, and if said electronic equipment certifies that the connection with said external device is a correct connection, outputs the control program from said program output unit of said external device and controls said external device based on said control program outputted from said program output unit.