A display control device controls a display device. The display device includes two or more input units to which information processing devices are connected. The display control device includes a storage unit, a determination unit, and a command generation unit. The storage unit stores device information and reception status information. The device information indicates a state of each of the information processing devices. The reception status information indicates one of the information processing devices, which outputs a display image displayed by the display device. The determination unit determines a content of an instruction from an user. The command generation unit generates a command to be issued to at least one of the display device and the information processing devices based on a determination result of the determination unit and the information stored in the storage unit.