Construction industry consists of many stakeholders and is becoming more complex and interactive. Especially, design phases have a great effect on the efficiency of construction life cycle. Unsystematic and qualitative design management has made it more difficult to accurately manage design stages. To solve this problem, this study developed Integrated Design Management System (IDMS), which is designed to flexibly accommodate change of the construction process, based on the definitions of both design information and relationship between stakeholders. IDMS has been developed under the following conditions: (i) defining the design work process including design works, input information, and output information, (ii) defining the person in charge, weight and checklist on each design works related to design management indices, (iii) incorporating owner requirements into the system to support the decision making process, (iv) uploading design documentation on IDMS as the design process progresses, thus design management indices such as manpower, schedule, quality and approval could be created automatically. This system can be implemented in actual design projects and make a more user-centered design atmosphere.