An information system, comprising: at least one information acquiring apparatus for acquiring information respectively from at least one acquisition space, which is a space for acquiring information; an information reproducing apparatus for constructing reproduced information associated with a reproduction space, which is different from the acquisition space and is a space that is a target to be reproduced; and at least one information output apparatus for outputting the reproduced information to at least one output space, which is a space for outputting the reproduced information; wherein the information acquiring apparatus includes: an information acquiring unit adapted to acquire first information which is image or sound, said first information being image or sound that is acquired in an environment; and an acquired information transmitting unit adapted to transmit the first information to the information reproducing apparatus; the information reproducing apparatus includes: a look-up table storage unit for storing a look-up table containing two or more pairs of pieces of association information and feature vectors in an associated manner, each piece of association information being an operational expression for converting said first information into second information which is image or sound that is acquired in another environment different from that of the first information; an acquired information receiving unit adapted to receive said first information respectively from the at least one information acquiring apparatus; a reproduced information acquiring unit adapted to construct the second information as reproduced information, using the first information received by the acquired information receiving unit and the look-up table stored in the look-up table storage unit; and a reproduced information sending unit adapted to transmit the reproduced information constructed by the reproduced information acquiring unit to the at least one information output apparatus; and the information output apparatus includes: a first reproduced information accepting unit adapted to receive reproduced information from the information reproducing apparatus; and a first reproduced information output unit adapted to output the reproduced information received by the first reproduced information accepting unit, wherein the reproduced information acquiring unit is adapted to extract a feature vector comprising one or more features of the first information received by the acquired information receiving unit, acquire, from the look-up table stored in the look-up table storage unit, association information associated with a feature vector with the smallest distance from the extracted feature vector, and generate the reproduced information, by applying the acquired association information to said first information received by the acquired information receiving unit. an information acquiring unit adapted to acquire first information which is image or sound, said first information being image or sound that is acquired in an environment; and an acquired information transmitting unit adapted to transmit the first information to the information reproducing apparatus; a look-up table storage unit for storing a look-up table containing two or more pairs of pieces of association information and feature vectors in an associated manner, each piece of association information being an operational expression for converting said first information into second information which is image or sound that is acquired in another environment different from that of the first information; an acquired information receiving unit adapted to receive said first information respectively from the at least one information acquiring apparatus; a reproduced information acquiring unit adapted to construct the second information as reproduced information, using the first information received by the acquired information receiving unit and the look-up table stored in the look-up table storage unit; and a reproduced information sending unit adapted to transmit the reproduced information constructed by the reproduced information acquiring unit to the at least one information output apparatus; and a first reproduced information accepting unit adapted to receive reproduced information from the information reproducing apparatus; and a first reproduced information output unit adapted to output the reproduced information received by the first reproduced information accepting unit,