PROBLEM TO BE SOLVED: To provide a judgment material capable of measuring the degree of excitement of a community, and notifying or selling a product to a community, notifying or soliciting an event, and determining the manner of providing or receiving other information. A method for measuring the activity of a community, which is a group of users who interact with each other about a specific purpose or topic, is provided. Information A about a user's behavior in a place where the users interact online is provided. Gathering information, gathering information B about the user's behavior for one or more events held offline by the host, which hosts and / or manages the user and / or community, and online using information A The activity A1 of the user in step S1, the activity B1 of the user off-line using the information B, and the activity C1 from the activity A1 and the activity B1. [Selection diagram] Figure 1
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