To prepare an adequate liquid feed plan without depending on competency of suppliers or operators.SOLUTION: A liquid feed plan preparation device which prepares a liquid feed plan for feeding a liquefied gas from a supply tank to a receiving tank through a liquid feed line connected to the receiving tank comprises: an information acquisition part for acquiring reception-side information including tank performance information related to performance of the receiving tank and tank state information related to a state of the liquefied gas contained in the receiving tank, and supply-side information including supply-side state information related to a state of the liquefied gas fed from the supply tank; a state prediction part which determines a prediction value of information representing at least a part of a liquid feed step and a preparation step thereof based upon the reception-side information and supply-side information; and a liquid feed plan preparation part which makes...

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