Most studies on entrepreneurship have asserted that many start-up companies have failed due to the lack of resources and networks with external stakeholders. Systematic resource management can be achieved by business process management (BPM). Nevertheless, there would be no study to explain how BPM apply to them. This study would like to suggest that startups should have an unique model regarding BPM, and would like to designate it entrepreneurial business process (EBP). EBP explains the unique phenomenon of startups, from a variety of viewpoints of Know-Why, Know-What, Know-Who, and Know-How. Based on the EBP, this study would like to propose an entrepreneurial business process notation (E-BPN) to define the procedure or the process to secure and use resources, extending existing business process modelling notations. The proposed methodology and notation will contribute to make the more effective entrepreneurial business process and to manage the factors affecting the growth of startups.