To provide a contract conversion processing system by which a customer does not have to pay the initial insurance fee in cash and an insurance company does not have to collect money nor receive money in the case of converting a life insurance contract.

This system is provided with a convertible price calculating means for calculating the convertible price of the existing insurance contract, a paid insurance fee (1) calculating means for calculating the paid insurance fee (1) of a new contract at the time of appropriating the calculated convertible price to the new contract as a paid insurance fee, an appropriation insurance fee calculating means for calculating an insurance fee for one time at the time of appropriating the prescribed number of times of insurance fees from the initial time of the new contract with the convertible price, and a paid-in insurance fee (2) calculating means for calculating the paid-in insurance fee (2) of the new contract at the time of appropriating an amount obtained by subtracting the price for the prescribed number of times of the calculated appropriation insurance fee from the convertible price to the new contract as the paid insurance fee.