FIG. 7 is a sequence diagram showing an example of a process executed by the communication system 1 according to the first embodiment. A flow of a process of mainly selecting the access point of the communication destination for transmission for each piece of vehicle information using the vehicle M (the communication device 100), the access points AP2 and AP3, and the base station 10 will be mainly described below. The process shown in FIG. 7 may be iteratively performed at predetermined timings or intervals. Hereinafter, it is assumed that the vehicle M is located within the communication ranges A2-2 and A2-3 of the access points AP2 and AP3.
In the example of FIG. 7, the vehicle M transmits a request signal to the access point AP2 (step S100) and receives a response signal for the request signal (step S102). The vehicle M transmits a request signal to the access point AP3 (step S104) and receives a response signal for the request signal (step S106). Next, the vehicle M acquires a delay time period from the transmission of the request signal to the reception of the response signal as the communication quality with respect to each of the access points AP2 and AP3 (step S108).
