We To In the business system development project, there are stages of planning, development, system examination, and upgrade. However, because business knowledge and system development knowledge are united in the systems engineer individual, and the final system image is designed in the engineer's mind, the knowledge earned in the project is not adapted to the next system development project. Business knowledge and system development knowledge are different. A unification of measures for value of these two types of information is needed to treat the information equally. Additionally, because there are many tasks to be expected at the same time, for example; scheduled task, preparation task for the next task, and troubleshooting work, it is important for staff to judge what they should do during preparation work phase and actual work phase. All staff needs to prioritize their tasks. Then, this paper aims to achieve the project support agent. This project support agent should have the function of evaluating the value of knowledge and supporting judgment through all stages of the project. Additionally, because the environment around the system development is always changing, a function to evaluate the importance of knowledge from the data stream is needed so that the project support agent may acquire and understand information in real time.