A server device includes a communication unit, a storage unit, and a control unit. The control unit is configured to perform determining whether or not the residual amount of recording material in a cartridge is equal to or less than a first threshold, and determining whether or not the estimated number of cartridges is equal to or less than a second threshold. In response to determining that the recording material is not more than the first threshold and the number of cartridges is not more than the second threshold, the control unit transmits to an external device via the communication unit an order instruction to deliver a cartridge to the user of the image forming apparatus.