A detailed data storage apparatus creates, when a detailed data database that stores therein detailed data relatint to each stage of a process executed through multiple stages receives detailed data relating to a predetermined stage, forecast detailed data indicating contents predicted for a stage next to a predetermined stage and subsequent stages from the detailed data, and stores the forecast detailed data in the detailed data database. The apparatus includes an order holding unit that orders and holds the multiple stages; a determining unit that determines whether there is a stage immediately previous to the predetermined stage; and an offset detailed-data creating unit that creates offset detailed data including a content for offsetting the forecast detailed data created at the immediately previous stage when the determining unit determines that there is the immediately previous stage, so as to store the offset detailed data in the detailed data database.