Patent ID: 8229399

Claim:
A communication apparatus comprising: a readout unit constructed to read out, from a plurality of storage media each storing an identifier concerning a communication line, a first identifier and a second identifier; a communication unit constructed to determine the communication lines based on the first and second identifiers read out by the readout unit, and to perform communication by using the determined communication lines; a display unit; and a display control unit constructed to display a first display screen for displaying information corresponding to the first identifier and display a second display screen for displaying information corresponding to the second identifier, on the display unit, wherein, in case where there is not an incoming call, the display control unit displays the first display screen with a first predetermined size and displays the second display screen with a second predetermined size, a state of the communication line of the second identifier being displayed on the second display screen, and wherein, in a case where there is an incoming call to the communication line of the first identifier, the display control unit displays the first display screen with a size larger than the first predetermined size and displays the second display screen with a size smaller than the second predetermined size, the state of the communication line of the second identifier being displayed on the second display screen.