1. A configuration information management apparatus which totally manages a configuration item of an information system and its property information, comprising: a configuration information management database storing a configuration item of an information system having a set of “property:value”, and know-how relating to each set of “property:value” of the configuration item; and a management device storing the configuration item associated with know-how relating to the configuration item in the configuration information management database on a basis of the set of “property:value” of the configuration item.