A wireless communication method in a traffic system comprising a wireless base station as a roadside device and a plurality of wireless terminals as on-vehicle devices, the wireless communication method comprising: the on-vehicle device sending (S103; S126; S144; S164) an allocation request for a wireless resource to the roadside device; the roadside device, in response to receiving the allocation request, allocating (S104; S127; S145; S165) a roadside-vehicle resource that is a wireless resource for roadside-vehicle communication between the roadside device and the on-vehicle device and an inter-vehicle resource that is a wireless resource for inter-vehicle communication between the on-vehicle devices, and sending (S106; S129; S147; S167) allocation information on the allocation to the on-vehicle device; and the on-vehicle device carrying out the roadside-vehicle communication with the roadside device using the roadside-vehicle resource identified with the allocation information received from the roadside device, and carrying out inter-vehicle communication with other on-vehicle device using the inter-vehicle resource identified with the allocation information wherein the wireless resource is a communication domain defined by frequency and time, wherein a downlink roadside-vehicle communication domain from the roadside device to the on-vehicle device, an inter-vehicle communication domain for the inter-vehicle communication, and an uplink roadside-vehicle communication domain from the on-vehicle device to the roadside device are time-division multiplexed such that the downlink roadside-vehicle communication domain, the inter-vehicle communication domain, and the uplink roadside-vehicle communication domain are arranged in the wireless resource along a time axis in the order of the downlink roadside-vehicle communication domain, the inter-vehicle communication domain and the uplink roadside-vehicle communication domain, and wherein the wireless communication method further comprises the on-vehicle device sending (S112; S135; S153; S173) information to a local vehicle using a local on-vehicle device transmission domain allocated to the local on-vehicle device among a plurality of on-vehicle device transmission domains, and receiving (S115; S138; S156; S176) information sent by another on-vehicle device using another on-vehicle transmission domain among the plurality of on-vehicle device transmission domains except for the local on-vehicle device transmission domain, the plurality of on-vehicle device transmission domains being obtained by time division on the inter-vehicle communication domain. the on-vehicle device sending (S103; S126; S144; S164) an allocation request for a wireless resource to the roadside device; the roadside device, in response to receiving the allocation request, allocating (S104; S127; S145; S165) a roadside-vehicle resource that is a wireless resource for roadside-vehicle communication between the roadside device and the on-vehicle device and an inter-vehicle resource that is a wireless resource for inter-vehicle communication between the on-vehicle devices, and sending (S106; S129; S147; S167) allocation information on the allocation to the on-vehicle device; and the on-vehicle device carrying out the roadside-vehicle communication with the roadside device using the roadside-vehicle resource identified with the allocation information received from the roadside device, and carrying out inter-vehicle communication with other on-vehicle device using the inter-vehicle resource identified with the allocation information wherein the wireless resource is a communication domain defined by frequency and time, wherein a downlink roadside-vehicle communication domain from the roadside device to the on-vehicle device, an inter-vehicle communication domain for the inter-vehicle communication, and an uplink roadside-vehicle communication domain from the on-vehicle device to the roadside device are time-division multiplexed such that the downlink roadside-vehicle communication domain, the inter-vehicle communication domain, and the uplink roadside-vehicle communication domain are arranged in the wireless resource along a time axis in the order of the downlink roadside-vehicle communication domain, the inter-vehicle communication domain and the uplink roadside-vehicle communication domain, and wherein the wireless communication method further comprises the on-vehicle device sending (S112; S135; S153; S173) information to a local vehicle using a local on-vehicle device transmission domain allocated to the local on-vehicle device among a plurality of on-vehicle device transmission domains, and receiving (S115; S138; S156; S176) information sent by another on-vehicle device using another on-vehicle transmission domain among the plurality of on-vehicle device transmission domains except for the local on-vehicle device transmission domain, the plurality of on-vehicle device transmission domains being obtained by time division on the inter-vehicle communication domain.