PROBLEM TO BE SOLVED : To improve the efficiency in office work and reduce space for an office.SOLUTION : A headquarters having a server which accumulates information on real estate properties and customers, real-estate franchisees having terminals connected with the server of the headquarters via Internet and customers who want to lease, purchase and sell the real estate properties exist. In addition, information-providing method in real estate industry comprises the following steps : A step of the customers' calling up the headquarter on Internet by using the terminals on their sides or franchisees' sides, a step of the headquarters' displaying a map which displays a network of transportation facilities, a step of the customers' selecting getting-on-and-off places of the transportation facilities displayed on the searching map and a step of the headquarters' displaying the real estate properties located around the getting-on-and-off places.