An apparatus of the present invention for displaying an image comprises connected device controller 22 for notifying one of a plurality of apparatuses S1 to Sn for transmitting an image connected via a network 99 and that has made a first connection request after activation, of information that display authority that is a right to preferentially perform processing for displaying an image is granted and of information that image data may be transmitted at any time, and for notifying another one or more of the plurality of apparatuses for transmitting an image and that have made a connection request, of information that image data cannot be transmitted unless permitted.