A vehicle management server includes: a communication device that acquires data including location information of a target vehicle through communication, the target vehicle being a vehicle not connected to the power grid out of vehicles; and a processor that sets a frequency of communication at which the data is acquired from the target vehicle. The processor acquires the data from the target vehicle. The processor predicts connection time from the acquired data according to a time prediction model and calculates confidence of the predicted connection time, the connection time being time when the target vehicle becomes connectable to the power grid, and the time prediction model being a model that predicts the connection time based on the data from the target vehicle. The processor sets the frequency of communication according to the confidence.