An information processing device includes a communication unit and a controller. The communication unit performs data communication with another vehicle present in a periphery of a host vehicle. The controller controls the data communication performed by the communication unit. The controller specifies each second other vehicle for which a quality of communication with the host vehicle does not satisfy a prescribed standard as a designated moving body. The controller identifies a relative position relative to the host vehicle, and a reception power of radio waves received from the designated moving body, for each designated moving body. The controller controls directivity related to wireless communication performed by the communication unit based on the relative position and reception power for each other vehicle.