There is provided a method for displaying traffic information, a navigation system, and a program for displaying the traffic information. A data processing unit receives a specified time 1203, which is a future or current time, through an operation input unit, specifies an area of a map to be displayed, and then obtains map data of the specified area from a map data storage unit. The data processing unit obtains traffic information 1201 of the specified time from a traffic information storage unit, and then makes the display unit show links in association with the traffic information 1201. It is, therefore, possible to display the traffic information of an arrival time at each point on a route in a user-friendly manner.