An information processing system includes: a reception processor which receives a display request for displaying a display screen of a first user terminal on one or a plurality of display devices, from the first user terminal of a first user among a plurality of users participating in a conference; a specifying processor which specifies a first display application for enabling the display screen to be shared by all users participating in the conference, of display applications which can be used in the first user terminal and the one or plurality of display devices, when the display request has been received by the reception processor; and an output processor which outputs a display instruction including information of the first display application specified by the specifying processor, to the first user terminal.