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I'd like to suggest how to decide the theme, the key element of the theme park, when we expand the spatial analysis of the theme park toward cyber space and realize it in the on-line environment. When we divide the theme of the theme park to background theme, which becomes a background for entire theme park, and sub-theme, the basis of attraction, the background theme is the start of the story. The sub-theme that consists those attractions can be developed in a form of episode. In digital storytelling that doesn't follow a linear structure, each sub-theme doesn't need to be connected narratively and consecutively to maintain the theme. However, to make the users feel like their own experiences, sub-theme must has unity, as well as variety. Also, it should be considered whether the action is feasible for the user.