A disclosed method include: receiving, an identifier of a user, an identifier of contents associated with the user and identification data concerning a sensor that read the identifier of the user; reading an identifier of a node associated with the received identification data or a combination of the received identification data and the received identifier of the user, from a data storage unit storing an identifier of a node that will cache contents to be outputted to a display device provided at a different position from a position of a sensor in association with identification data concerning the sensor or a combination of identification data concerning the sensor and an identifier of a user; and transmitting the received identifier of the user and an identifier of contents associated with the user to a node whose identifier was read.