A device includes a connector including first and second portions, each being configured to establish an independent data connection with a portion of first and second connectors in an external device, and a controller. When the first portion is connected with a third portion of the first external connector, and a request to connect with the second portion is received from the second external connector, the controller determines whether or not to accept the request, and transmit an acceptance signal or a rejection signal to the second external connector through the second portion, according to the determination result.