To provide composite device apparatus capable of simplifying opera tion and excluding competition between devices by providing at least two devices and making a user be conscious of only one device by which control is executed while controlling the operation of the other device, a composite device system, a composite device control method and a medium in which a composite device control program is recorded.

Control of operation of a scanner 20 and a printer 40 connected by every logic channel is enabled to be executed by control 30 based on a command inputted by an USB port 10a or an operation panel 35 and an channel ID included in the same command. In addition, a printing processing, etc., to occupy the printer 40 for a long time is temporarily interrupted and a desired printed matter are promptly acquired by setting a priority order to use the printer 40.