PROBLEM TO BE SOLVED: To easily authenticate an unregistered person on the spot when a person who is not preliminarily account-registered participates in an online conference, and to enable the unregistered person to use an online conference system.;SOLUTION: In an online conference system using a plurality of conference terminals, a display device displays a code including conference identification information for identifying an online conference, and a first conference terminal images and decodes the code to acquire the conference identification information, and transmits the conference identification information and user information of a first user via a conference server to a second conference terminal, and a second user who has accepted the first user's participation in the conference inputs an authentication request on the basis of the conference identification information and the user information in the second conference terminal, and the conference server executes first authentication of the first user in accordance with the authentication request, and transmits a first authentication result and the conference identification information to the first conference terminal.;SELECTED DRAWING: Figure 1;COPYRIGHT: (C)2017,JPO&INPIT
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