To provide a system, a method, and a service for a virtual time travel, using a network, which enables a user to bodily sense the time travel without actualizing a time travel on the time base.

A data server group 101 which stores past or future video and sound at random, a retrieval server 104 where an operator 100 retrieves desired data from the stored data, and a terminal 106 which downloads the retrieved data are connected through a network 110, and a plurality of video cameras 102, microphones, a large-sized display 108 and headsets 107 which reproduce video and sound, and a wireless controller 107 for controlling the terminal are connected to a terminal device; and a composition program 105 in the terminal composites the video and sound of the operator obtained by the video camera and microphone with the desired video and sound downloaded from the data server group and reproduces them.