A priority determination system incudes a processor, a terminal, and a memory. The processor obtains anomaly data items, each indicating an anomaly in a corresponding one of moving bodies, and obtains state data items, each indicating a state of a corresponding one of the moving bodies. The processor calculates, for each anomaly data item, a risk value indicating a risk of the anomaly based on a state data item of the corresponding one of the moving bodies, determines a priority of a task for dealing with the anomaly indicated by each anomaly data item based on the risk value, and provides an output to the terminal to execute the task. The terminal displays an alert related to at least one of the priority of the task, the risk value, or an estimated dealing time required for completing the task.