A server of a job opportunity registrant management system includes, as its functions: a registration information acceptance module that accepts registration information for employment for a business operator, and registers a registrant (first registrant) belonging to the business operator, a registrant (second registrant) belonging to a managing entity, and a registrant (third registrant) not belonging to a specific business operator or managing entity, with attributes different from each other; a job offering information acceptance module that accepts job offering information from the business operator; and a job offering information presentation module that presents, to the registrant, the job offering information with respect to the attribute of the registrant to whom the job offering information is provided.