A search extend setting unit that identifies a layer made to correspond to an asset specified by referencing a first database for recording assets made to correspond to each of users by relating each of the assets to a first layer that is a layer related to a virtual system individually used by each of the users, or to a second layer that is a layer related to hardware and software, and to set an extent for extracting information about other assets having a relationship with the specified asset according to a layer of the specified asset, and an extracting unit that extract other assets that have a relationship with the specified asset and are present in the extent set by referencing the first database and a second database for recording information indicating a relationship among the assets, and the first database based on the first asset.