An information processing device in a first vehicle: detects a head-on approach of a second vehicle relative to the first vehicle; determines whether a meeting point is in a first section; calculates a first distance between the first section and the meeting point; when the meeting point is not in the first section, transmits the first distance to the second vehicle, and receives, from the second vehicle, a second distance between the meeting point and a second section; generates travel control information for the first vehicle according to the result of comparison between the first distance and the second distance; and outputs the travel control information to a travel controller of the first vehicle.