In this study, authors participated in the process of re-designing an information system for civil activities. From viewpoint of Actor Network Theory, they mainly pointed out two findings. Firstly, designing an information system inevitably includes (re-)designing related social organization and activity itself. Therefore the requirement engineering approach has its limitations, for it implicitly assumes that activities and social organization are out there independently from information systems, user requirements already exist, and they can be obtained out with various methods. Secondly, the subject of the information system design should not be regarded as an isolated individual or a team. It is a fluid network including artifacts and people with various interests. Moreover, these actors sometimes participate in, and withdraw from, the project. A new approach, the network-oriented approach, is required to make a useful information system, which will not cause serious breakdown.