再利用を伴う新規のソフトウェア開発に当たっては，最初に，作業工数や期間，必要人員ならびにそのスキル，開発費用等の見積りを実施し，開発者や費用等のリソースを確保して，開発プロジェクトを実行する必要がある．本稿では，既存ソフトウェアのモジュール間関係を可視化できる構成管理ツールを活用した見積り支援システムを提案する．本システムでは，開発範囲の見極め，洗い出したソフトウェアモジュールを基にした開発工数の予測集計による見積りを支援する．さらに本稿では，本手法を組み込みソフトウェア再利用開発に用いた評価について述べる．To develop a new piece of reuse-based software, the first task is to estimate the workload, the time, the human resource availability and their skill level, the reusable software resources, and the cost that is necessary for development. Consequently, the correct amounts of resources, such as development members and costs, must be prepared; then the development project can proceed. In this paper, we propose an estimate support method using a software organization management tool that can visualize the relationships among the existing software modules, and estimate data linked to each module. The method allows investigation of the existing software to select reusable modules and gathers estimate data to produce an estimate for a development workload while taking into consideration of the complexity of every software module found. Furthermore, this paper describes an evaluation when the proposed method is used in a reuse-based software development project for embedded software system.