A charging system comprising: an electric bus; and a charger, wherein the electric bus includes: a storage functional unit; a drive unit configured to drive the electric bus using power discharged from the storage functional unit; a charging unit configured to charge the storage functional unit using power supplied from the charger; and a first communication unit configured to receive an identifier of the charger from the charger, and transmit a first command commanding a start of radio communication, to the charger identified by the received identifier, wherein the charger includes: a supply unit configured to supply power to the electric bus stopped at a preset position; and a second communication unit the system being characterised in that the second communication unit is configured to, if power is not being supplied to the electric bus by the supply unit, to periodically transmit a first identifier of the charger and not a second identifier of the charger, if power is being supplied to the electric bus by the supply unit, to periodically transmit the second identifier and not the first identifier if power cannot be supplied to the electric bus by the supply unit, to periodically transmit both of the first identifier and the second identifier, and if the first command is received by the second communication unit from the electric bus after transmitting at least one of the first identifier and the second identifier, to transmit and receive information related to charging of the storage functional unit, with the electric bus being a transmission source of the first command, using radio communication, and wherein, the first communication unit is configured to, if the second identifier is received, prohibit transmission of the first command, and if both of the first identifier and the second identifier are received, to also determine that the charger is unable to supply power. a storage functional unit; a drive unit configured to drive the electric bus using power discharged from the storage functional unit; a charging unit configured to charge the storage functional unit using power supplied from the charger; and a first communication unit configured to receive an identifier of the charger from the charger, and transmit a first command commanding a start of radio communication, to the charger identified by the received identifier, wherein the charger includes: a supply unit configured to supply power to the electric bus stopped at a preset position; and a second communication unit the system being characterised in that the second communication unit is configured to, if power is not being supplied to the electric bus by the supply unit, to periodically transmit a first identifier of the charger and not a second identifier of the charger, if power is being supplied to the electric bus by the supply unit, to periodically transmit the second identifier and not the first identifier if power cannot be supplied to the electric bus by the supply unit, to periodically transmit both of the first identifier and the second identifier, and if the first command is received by the second communication unit from the electric bus after transmitting at least one of the first identifier and the second identifier, to transmit and receive information related to charging of the storage functional unit, with the electric bus being a transmission source of the first command, using radio communication, and a supply unit configured to supply power to the electric bus stopped at a preset position; and a second communication unit the system being characterised in that the second communication unit is configured to, if power is not being supplied to the electric bus by the supply unit, to periodically transmit a first identifier of the charger and not a second identifier of the charger, if power is being supplied to the electric bus by the supply unit, to periodically transmit the second identifier and not the first identifier if power cannot be supplied to the electric bus by the supply unit, to periodically transmit both of the first identifier and the second identifier, and if the first command is received by the second communication unit from the electric bus after transmitting at least one of the first identifier and the second identifier, to transmit and receive information related to charging of the storage functional unit, with the electric bus being a transmission source of the first command, using radio communication, and if power is not being supplied to the electric bus by the supply unit, to periodically transmit a first identifier of the charger and not a second identifier of the charger, if power is being supplied to the electric bus by the supply unit, to periodically transmit the second identifier and not the first identifier if power cannot be supplied to the electric bus by the supply unit, to periodically transmit both of the first identifier and the second identifier, and if the first command is received by the second communication unit from the electric bus after transmitting at least one of the first identifier and the second identifier, to transmit and receive information related to charging of the storage functional unit, with the electric bus being a transmission source of the first command, using radio communication, and wherein, the first communication unit is configured to, if the second identifier is received, prohibit transmission of the first command, and if both of the first identifier and the second identifier are received, to also determine that the charger is unable to supply power.