Navigation method, navigation system, moving body, and navigation program

A navigation system comprising:

• a moving body;
• and
• a server that communicates with the moving body, wherein
• the server includes
• an estimation unit that estimates, based on schedule information indicating one or more events to be occurred and information related to a location associated with each of the one or more events, an area and time at which congestion is likely to occur around the location, and
• a transmitter that transmits an estimated result of the estimation unit to the moving body, and
• the moving body includes
• a receiver that receives the estimated result, and
• a display unit that displays information which is based on the estimated result, and which is related to a movement plan when moving using the moving body based on the schedule information.