To provide an automatic calculation method and a fraud prevention system for a card game in casino.

A dealer IC tag reader position 4 is disposed in front of a dealer 2 of a game table 1, a monitor device 8 is disposed thereby, player IC tag readers 5 (5-1 to 5-5) are disposed in front of respective players 3, and a server device 7 is connected thereto. When the players 3 place chips 15 on the table, the IC tags 16 incorporated in the chips are read by the player IC tag readers 5, and a bet for every player 3 is calculated. When the dealer 2 deals out cards 10, the IC tags incorporated in the cards are read by the dealer IC tag reader position 4 and the player IC tag readers 5, and the types and the points of the cards 10 are automatically recognized. When the game is finished, the win/defeat and refund amounts to win players are calculated and the results are displayed on the monitor device 8. The IC tags of refund chips 15 are read, the refund amount and the calculated refund amount are compared and, when they are agreed with each other, the game is finished and, if they are not agreed, an alarm is notified and recorded.