A user operates a digital camera so as to attach a photographed image to an e-mail describing a user ID and space ID, and transmit the e-mail to a mail server. The mail server reads out the user ID, space ID, and attached image data from the received e-mail. After setting a frame ID for a frame to exhibit the image data in a shared virtual space, the mail server transmits the image data, space ID, and frame ID to an AO server. The AO server stores the received data and also transmits the data to a CP server. The CP server transmits the received data to multiple client computers. The client computers display the received image at a predetermined location in the shared virtual space, specified by the frame ID. This allows the user to easily upload information.