Next, a second embodiment of a communication system will be described. The communication system of the second embodiment is different from the communication system 1 of the first embodiment in that, in a situation in which a vehicle M # is connected to a plurality of access points AP (for example, a state in which communication using an assigned channel is possible), control for releasing a connected state associated with at least one access point among the plurality of access points AP is performed when communication quality satisfies a predetermined condition. Therefore, the above-described difference will be mainly described below. Because configurations similar to those of the communication system 1, the base station 10, and the access point AP in the first embodiment can be applied as configurations of a communication system, a base station, and an access point in the second embodiment, the specific description here will be described. In the following description, components similar to those in the first embodiment are denoted by the same reference signs and description thereof will be omitted.