PROBLEM TO BE SOLVED : To improve the contract success rate and to efficiently execute real estate agency operation by attaining optimum connection between customer and article. SOLUTION : Article data inputted by an article data input means A are stored in an article data storing means B and customer data including the name of a customer and required conditions inputted by a customer data input means C are stored in a customer data storing means D. An article specified by an article specifying means E or an article newly inputted by the article data input means A is set up as an objective article, an expected customer candidate extracting means F retrieves customer data stored in the storing means D and extracts expected customer candidates whose requiring conditions almost coincide with the objective article and an expected customer registering means H registers an expected customer specified by an expected customer specifying means G from the expected customer candidates as an expected customer for the objective article.