A mediating method by a mediating device comprises receiving a first list including at least one item from a first terminal and receiving at least one list from at least one terminal different from the first terminal, searching for a list including an item corresponding to at least one item among the at least one item of the first list, among the received at least one list, and transmitting information on the corresponded item, according to a result of the search, to each of the first terminal and a terminal which provides the list including the item corresponding to the at least one item among the at least one terminal.