1. An display apparatus comprising:a transceiver,
a memory; and
a controller configured to:
control the memory to store first information on a first frequency band which the display apparatus uses for wireless communication with an access point,
control the transceiver to receive, from a portable apparatus second information on a second frequency band which the portable apparatus uses for wireless communication with the access point or another access point,
determine a frequency band of a peer-to-peer (P2P) wireless channel between the display apparatus and the portable apparatus to one of the first frequency band and the second frequency band, and
control the transceiver to establish a wireless peer-to-peer (P2P) connection with the portable apparatus based on the determined frequency band of P2P wireless channel.