System and apparatus for information display

A system for displaying information comprising:

• a communication apparatus within a presentation room including information to be presented to multiple users in the presentation room;
• an apparatus within the presentation room to receive the information from the communication apparatus and comprising:
• a key information producing unit including a processor configured to produce key information used to authenticate said communication apparatus;
• a key information distributing unit including a processor configured to distribute said key information only to the presentation room;
• an authentication information receiving unit including a processor configured to receive authentication information from the communication apparatus in the presentation room;
• an authenticating unit including a processor configured to authenticate said communication apparatus by verifying whether or not said authentication information was formed based upon said key information;
• a display information receiving unit including a processor configured to receive display information from said authenticated communication apparatus;
• and
• an output unit to display the display information received from said authenticated communication apparatus to the multiple users in the presentation room;
• wherein said authenticated communication apparatus has a distribution range during reception of said key information such that said outputted key information can be acquired;
• wherein said key information distributing unit includes a display unit configured to visually display said key information, and the distribution range of said key information is such that said key information displayed on said display unit can be visually viewed within the presentation room.

A method for displaying information received from a communication apparatus within a presentation room and which information is to be presented to multiple users in the presentation room, comprising:

• producing, by a key information producing unit including a processor, key information used to authenticate said communication apparatus;
• distributing, by a key information distributing unit including a processor, said key information only to the presentation room;
• receiving, by an authentication information receiving unit including a processor, authentication information from the communication apparatus in the presentation room;
• authenticating, by an authenticating unit including a processor, said communication apparatus by verifying whether or not said authentication information was formed based upon said key information;
• receiving, by a display information receiving unit including a processor, display information from said authenticated communication apparatus;
• and
• displaying, by an output unit, the display information received from said authenticated communication apparatus to the multiple users in the presentation room;
• wherein said authenticated communication apparatus has a distribution range during reception of said key information such that said outputted key information can be acquired;
• wherein said distributing said key information includes usually displaying, by a display unit, said key information, and the distribution range of said key information is such that said key information displayed on said display unit can be visually viewed within the presentation room.