INFORMATION PROCESSING SYSTEM, INFORMATION PROCESSING METHOD AND PROGRAM

摘要

PROBLEM TO BE SOLVED: To automatically delete friend information according to a degree of friend relation between participants.

SOLUTION: This information processing system 10 includes: a storage part 122 storing the friend information including a friend index indicating the degree of the friend relation between at least two participants; a calculation part 132 calculating the friend index according to action histories of the participants; and a deletion part 133 deleting the friend information when the friend index calculated by the calculation part 132 is smaller than a prescribed threshold value.

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