To support information sharing between terminals existing within a short distance from each other while a burden on a server administrator is prevented from increasing or decreased. An information sharing support server includes a server data transmission and reception control unit which recognizes identifiers of sending terminals associated with identifiers of originating terminals (STEP 446, STEP 466), recognizes identifiers of terminals associated with the relevant identifiers of the sending terminals (STEP 448, STEP 450, STEP 468), and transmits data to the relevant terminals (STEP 452, STEP 470).
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