A wireless communication method implemented by a first in-vehicle wireless communication apparatus constituting a vehicle-to-vehicle communication system, comprising: a position information acquisition step of acquiring position information relating to the first in-vehicle wireless communication apparatus; a vehicle data transmission step (105, S41) of transmitting vehicle data including the position information via a predetermined control channel; a vehicle data reception step (105, S41) of receiving vehicle data transmitted on the control channel from a second in-vehicle wireless communication apparatus; a map information acquisition step of acquiring, from a map information storage unit configured to store map information divided into a plurality of first areas, information relating to a first area including a current position of the first in-vehicle wireless communication apparatus; a determination step (102, S43) of determining whether or not to access a database apparatus storing white space information on the basis of the position information of the first in-vehicle wireless communication apparatus, acquired in the position information acquisition step, the position information of the second in-vehicle wireless communication apparatus, acquired in the vehicle data reception step, and the information relating to the first area, acquired in the map information acquisition step; a querying step (102, S44, S45) of acquiring white space information relating to a vicinity of the current position from the database apparatus after determining to access the database apparatus in the determination step; and a distribution step (105, S47) of transmitting the white space information acquired from the database apparatus in the querying step to a peripheral in-vehicle wireless communication apparatus. a position information acquisition step of acquiring position information relating to the first in-vehicle wireless communication apparatus; a vehicle data transmission step (105, S41) of transmitting vehicle data including the position information via a predetermined control channel; a vehicle data reception step (105, S41) of receiving vehicle data transmitted on the control channel from a second in-vehicle wireless communication apparatus; a map information acquisition step of acquiring, from a map information storage unit configured to store map information divided into a plurality of first areas, information relating to a first area including a current position of the first in-vehicle wireless communication apparatus; a determination step (102, S43) of determining whether or not to access a database apparatus storing white space information on the basis of the position information of the first in-vehicle wireless communication apparatus, acquired in the position information acquisition step, the position information of the second in-vehicle wireless communication apparatus, acquired in the vehicle data reception step, and the information relating to the first area, acquired in the map information acquisition step; a querying step (102, S44, S45) of acquiring white space information relating to a vicinity of the current position from the database apparatus after determining to access the database apparatus in the determination step; and a distribution step (105, S47) of transmitting the white space information acquired from the database apparatus in the querying step to a peripheral in-vehicle wireless communication apparatus.