Patent ID: 8311223

Claim:
A communication system, the system comprising: a control apparatus; a communication apparatus; and a display apparatus; the control apparatus comprising: a first generation unit configured to generate a first encryption key and first integrity information for validating the first encryption key; a first display control unit configured to display the first integrity information on a first display unit of the control apparatus; a first communication unit configured to perform communication with the communication apparatus based on the first encryption key, the communication apparatus comprising: a first connecting unit configured to connect to the display apparatus with a cable; a second generation unit configured to generate a second encryption key and second integrity information for validating the second encryption key; a second display control unit configured to notify the display apparatus of the second integrity information for having the display apparatus connected by the first connecting unit and display the second integrity information; a first determination unit configured to determine whether the second integrity information displayed on the display apparatus matches the first integrity information displayed on the first display unit of the control apparatus, based on a notification from the display apparatus; and a second communication unit configured to perform wireless communication with the control apparatus based on the second encryption key when the second integrity information matches the first integrity information, and the display apparatus comprising: a second connecting unit configured to connect with the communication apparatus with the cable; a second display unit configured to display the second integrity information notified from the communication apparatus; an input unit configured to input a confirmation result by a user that confirms whether the second integrity information displayed on the second display unit of the display apparatus matches the first integrity information displayed on the first display unit of the control apparatus; and a notifying unit configured to notify the confirmation result by the user in accordance with an input through the input unit to the communication apparatus.