| 摘要 |
There is provided a travelable range calculation method which is capable of showing a range whose bounds can be actually reached from a predetermined point within a predetermined time period. An input for designating a travel start position for map information is received. For instance, a candidate site for a new shop can be input as the travel start position. Then, traveling speeds at which predetermined transportation means can travel along respective roads in a neighborhood around the input travel start position, the traveling speeds being dependent on a traffic congestion status of the neighborhood are acquired. For instance, a traveling speed on a road section A is 5 km per hour, and a traveling speed on a road section B is 5 km per hour. Then, coverable routes which can be covered from the travel start position within a predetermined time period are determined based on the traveling speeds on the roads.
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