An information providing system includes an onboard device and a server configured to transmit and receive information to and from the onboard device. The onboard device includes: one or more first processors configured to acquire a current position and an output mode and to transmit the acquired current position and the acquired output mode to the server; and an output interface configured to output power source station recommendation information received. The server includes: one or more memories configured to store power source station information including position information of a power source station and a power source price detected from a captured image of the power source station; and one or more second processors configured to prioritize power source stations located within a predetermined range from the current position based on the output mode and to provide power source station information of the prioritized power source stations to the onboard device.