Abstract: Before design information is published, a consistency state of reference design information referred to by the design information is revealed. By this, it is possible to reduce waste caused by redesign or the like of the design information. Public design information used for designing the design information is stored as reference design information 210 into a developer design information storage part 202 (S5). When a developer requests publication of the design information that has used the reference design information 210, the design information is stored as public design information 261b into a public design information storage part 260 (S17). When the design information is stored in the public design information storage part 260, a consistency state between reference design information 210 of design information that uses the design information 261b and the design information 261 is verified (S19), and the verified consistency state is stored in a consistency state storage part 203.