be projected as an enlarged cursor 40 on the screen 4 the enlarged cursor 40 indicates the location of the mouse 12 on the monitor 11 and the location of the cursor 40 is controlled by the mouse 12 a plurality of users 41 42 43 are sitting close to the screen 4 with each user 41 42 43 provided with a user control unit 51 52 53 each user control unit 51 52 53 includes an access request button 51 a 52 a 53 a respectively for applications such as presentation when a user 41 42 43 actuates the access request button 51 a 52 a 53 a on the user control unit 51 52 53 the user control unit 51 52 53 generates a request signal to the computer 1 for permission to access the computer 1 once the request is granted and the connection is established an icon type 61 62 63 appears on the enlarged screen 4 the icon type 61 62 63 has a different appearance from the original computer cursor 40 and is also different from each other by for example variations in shape color or blinking and has a set of default access rights each user control unit 51 52 53 has a default identification code p_id this allows a plurality of users such as users 41 42 43 under the default access rights to interactively.