An apparatus according to one embodiment of this disclosure is a traffic flow simulator that simulates traffic flow of a plurality of simulated vehicles generated on a road network. The traffic flow simulator comprises a route selection unit that selects a route of the plurality of simulated vehicles in accordance with a predetermined route selection model, and an index calculation unit that moves the plurality of simulated vehicles on the road network in accordance with the route and calculates a traffic evaluation index of the road network. The route selection unit records in a storage unit a first route selected when a first mode described below is executed and a second route selected when a second mode described below is executed. First mode: operation mode that simulates traffic flow under a first setting condition Second mode: operation mode that simulates traffic flow under a second setting condition
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