PROBLEM TO BE SOLVED: To provide a digital writing system, an apparatus, a program and a method for preventing various troubles which may occur when used as they are at various events and live venues, and adding fun and entertainment. SOLUTION: In a digital message-writing system, a message-writing processing device acquires post information from an artist appearing in a box office and a plurality of post information from fans of the artist, and displays the acquired post information in an identifiable manner. Perform processing. The identification process is a process of displaying each posted information at a different position to prevent duplicate display and the like. Further, each post information that has undergone the identification process is used as the message information, and the message information is projected onto the wall of the venue of the entertainment using a projection device such as a projector. In addition, when a command to make specific posted information prominent is obtained, the color or shape of the posted information is changed to make it stand out. [Selection diagram] Fig. 1
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