PROBLEM TO BE SOLVED: To accurately predict the growth of crops at different positions in an agricultural land. SOLUTION: A first environmental data indicating a first cultivation environment at a first position is acquired, which is measured by a sensor device installed on a farmland. Using an environmental conversion model corresponding to a second position different from the first position, the first environmental data is converted into the second environmental data indicating the second cultivation environment at the second position. First, using a prediction model that generates state data indicating the state of a specific crop at a time point after the measurement time point from the environmental data, the second environmental data shows the prediction of the state of a specific crop at the second position. Generate state data for. The second state data indicating the state of a specific crop, which is measured at the second position after the measurement time of the first environmental data, is acquired. Calculate the error between the first state data and the second state data. Update the environment transformation model based on the error. [Selection diagram] Fig. 6
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