This paper is drawn upon a research about “Innovation Diffusion and Adoption of Geographic Information System (GIS) Wilmar in Wilmar's intra-organization.” This research focuses on the communication process as an effort to diffuse information system innovation. Another objective of this research is to collect information about how the users adopt the innovation after it is being diffused by the developer and the innovator of GIS Wilmar. The innovation of Geographic Information System was suggested by a manager who is also a geographical-oil palm plantation practitioner. This research was accomplished by using qualitative method, which involved exploring and capturing the social situation and strategy on how the innovator and the developer of GIS Wilmar communicate their information systems to the users and how the users response to that through the adoption of the innovation. The data collection needed for this research was collected using qualitative data collection method, namely Library Research and Field Research (in-depth interview and observation). The data was analyzed by going through all the data records both written and audio, and its result was shown systematically in descriptive way.