This research attempts to analyse user storytelling in virtual world, especially what causes user storytelling. For this purpose, This research examine environmental storytelling of Henry Jenkins. Environmental storytelling is a concept of Henri Jenkins, which is composed Evoked Story, Enacted Story, Embedded Story, Emergent Story. But, this concept is limited because it apply to just digital games like the Sims or Mist and based on spatiality of digital game. Therefore, environmental storytelling modified with the concept of \'semiology\'. A concept of environmental storytelling in virtual world is composed 4 types. Evoked Story is induced by \'sense of place\', user think \'where am I\' and it makes storytelling. Enacted Story is induced by \'sense of purpose\'. This case user want know \'what must I do?\'. Embedded Story is about \'what should I do?\', it means \'sense of possibility\'. Emergent story is something different the others, which is induced by \'who we are\' and based on \'sense of relationship\'. In networked virtual world , we can often find this special type storytelling. Furthermore, we introduce the recently cases of 4 types in virtual world and consider them theoretically. Namely, user storytelling in virtual world base on the 4 kind dimensions of place, purpose, possibility and relationship. And it useful to understand the nature of virtual world that the research about what makes user storytelling in virtual world.