NOVELTY - The method involves connecting a web server for providing user integrated information. A log-in message is outputted to a screen, when a user selects log-in in the web server. A member agreement and member information are outputted to the screen, when authenticating user is a non-member. The member information inputted by the user is stored in a member database, and the user is registered to be a member. Breakdown of a unit price including a material cost, labor cost and expenses is outputted to the screen.    USE - Method for offering cost such as labor cost, material cost, information for a construction such as air conditioner facility construction, sanitation and fire extinguishing system construction, gas facilities construction, plant facility construction, thermoelectric power generator system establishment construction, right season machine equipment construction, garbage incineration machine equipment construction, reclaimer establishment construction, power transmission establishment construction, electric energy establishment construction, power distribution establishment construction, extension establishment construction, measurement and automatic control equipment construction, electric installation construction, aeronautical light establishment construction, line construction, transfer facility construction, electric railway construction, exchanging equipment construction, communication power source construction, foundation construction and dismantling construction (all claimed).    ADVANTAGE - The method simply, efficiently and conveniently provides affirmative vote approach recent data for construction cost accumulation, where the recent data are applied quickly and reliably. The method satisfies the user by uploading specification information and a related picture of relative firm at the same time, where the accessibility of the user is intensified with the realistic enterprise breakdown of unit price.    DESCRIPTION OF DRAWING(S) - The drawing shows a flowchart illustrating steps of a cost information offering method.'(Drawing includes non-English language text)'