A vehicle communication control device used for a vehicle, comprising: a nearby vehicle information acquirer configured to successively acquire nearby vehicle information representing a running condition of at least one nearby vehicle around a subject vehicle and generation time of the nearby vehicle information, wherein the nearby vehicle information and the generation time are generated in an in-vehicle unit mounted on the at least one nearby vehicle and successively transmitted by communication from outside the subject vehicle, wherein the nearby vehicle information acquirer is configured to acquire the nearby vehicle information including a position of the nearby vehicle; a subject vehicle information generator configured to cyclically generate subject vehicle information representing a running condition of the subject vehicle, wherein the subject vehicle information generator is configured to generate the subject vehicle information including a position of the subject vehicle; an assistance information generator configured to generate assistance information for driving assistance of the subject vehicle by using the nearby vehicle information and the subject vehicle information; characterized by a difference calculator configured to calculate a difference between a generation time of a most recent subject vehicle information and a generation time of a most recent nearby vehicle information; a cycle changer (108, 108a) configured to change a generation cycle of the subject vehicle information in the subject vehicle information generator so as to decrease the difference, a map acquirer configured to acquire map data; a priority determiner configured to determine either the nearby vehicle or the subject vehicle to be prioritized by using the position of the nearby vehicle, the position of the subject vehicle, and the map data; and a change requester configured to transmit request information to the nearby vehicle, the request information requesting a change in a generation cycle of the nearby vehicle information in the nearby vehicle so as to decrease the difference, wherein the request information includes the difference, wherein, when the priority determiner determines that the nearby vehicle is to be prioritized, the cycle changer (108, 108a) changes the generation cycle of the subject vehicle information in the subject vehicle information generator so as to decrease the difference, and wherein, when the priority determiner determines that the subject vehicle is to be prioritized, the change requester transmits the request information to the nearby vehicle. a nearby vehicle information acquirer configured to successively acquire nearby vehicle information representing a running condition of at least one nearby vehicle around a subject vehicle and generation time of the nearby vehicle information, wherein the nearby vehicle information and the generation time are generated in an in-vehicle unit mounted on the at least one nearby vehicle and successively transmitted by communication from outside the subject vehicle, wherein the nearby vehicle information acquirer is configured to acquire the nearby vehicle information including a position of the nearby vehicle; a subject vehicle information generator configured to cyclically generate subject vehicle information representing a running condition of the subject vehicle, wherein the subject vehicle information generator is configured to generate the subject vehicle information including a position of the subject vehicle; an assistance information generator configured to generate assistance information for driving assistance of the subject vehicle by using the nearby vehicle information and the subject vehicle information; characterized by a difference calculator configured to calculate a difference between a generation time of a most recent subject vehicle information and a generation time of a most recent nearby vehicle information; a cycle changer (108, 108a) configured to change a generation cycle of the subject vehicle information in the subject vehicle information generator so as to decrease the difference, a map acquirer configured to acquire map data; a priority determiner configured to determine either the nearby vehicle or the subject vehicle to be prioritized by using the position of the nearby vehicle, the position of the subject vehicle, and the map data; and a change requester configured to transmit request information to the nearby vehicle, the request information requesting a change in a generation cycle of the nearby vehicle information in the nearby vehicle so as to decrease the difference, wherein the request information includes the difference, wherein, when the priority determiner determines that the nearby vehicle is to be prioritized, the cycle changer (108, 108a) changes the generation cycle of the subject vehicle information in the subject vehicle information generator so as to decrease the difference, and wherein, when the priority determiner determines that the subject vehicle is to be prioritized, the change requester transmits the request information to the nearby vehicle.