A first information processor in a conference room acquires the image of a document placed on a first projection surface as a material shared with a remote site. The first information processor extracts an image indicating a user based on an image obtained by capturing the image of an area including a projection area projected to a projection surface and a distance acquired by a sensor. A second information processor at the remote site extracts an image indicating a user at the remote site based on an image obtained by capturing the image of an area including a projection area projected to the projection surface and a distance acquired by a sensor. The first information processor projects an image indicating the user at the remote site. The second information processor projects the images of the document acquired by the first information processor and the user located at the remote site.