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 communication unit has a normal mode, and a directivity mode in which directivity of wireless communication is controlled to a greater extent than in the normal mode so that data communication can be performed with another vehicle at a position at which data communication cannot be performed in the normal mode. The controller receives server data from a server that includes information pertaining to the other vehicle present at the position at which data communication cannot be performed in the normal mode. The controller controls the directivity of the wireless communication of the communication unit based on the information pertaining to the other vehicle from the server.