Each device arranged in an information space and a computer are sustainedly connected and the connection can be visually recognized on the display screen of the computer. More specifically, there is provided a feature of "gaze-link" metaphor with which connection between the computer and an object viewed by a camera is established. A visible marker may be applied to the object of connection so that the object may be identified by shooting the object by means of a camera and connection may be established between the computer and the object. As the connection between the identified object and the computer is sustained, the user can specify the target of operation in an intuitive and direct manner without worrying about the ID of each device in a network environment where a large number of devices are mutually connected.