A method is designed for searching contents information presented by a plurality of information sites over a network based on a query sent from a client terminal to a searching server through the network. The method is carried out by the computer-implemented steps of registering information sites which present contents information involving various items and actions related to each other, initiating the client terminal to transmit a query to the searching server through the network, the query containing an item keyword indicating an item as a target of searching and an action keyword indicating an action to be made on the item, operating the searching server according to the query to search for one or more of the registered information sites having contents information matching the query, and to send back directory information indicative of locations of the searched information sites to the client terminal, and operating the client terminal according to the directory information for accessing the searched information sites, thereby enabling a user to make the action on the item.