An invention allowing the exchange of community cards within a virtual space by an easy operation. A display screen shown on the display section of the user terminal device is composed of a virtual space display for displaying three-dimensional objects in a virtual space, and a list window of belongings displayed by the user's own community cards. The user can move freely within the virtual space while referring to the virtual space display, and when conversing with other users within the virtual space and the user wants to let another user participate in the community the user himself belongs to, the user can present community cards corresponding to the avatar, to a user for newly participating in the community, by drag-and-drop of any of the community cards on the avatar.