A device control system is provided, in which a host device uploads optimal program code suitable for its own system environment from a target device for control. In the target device 2, a plurality of pieces of program code 231 through 23n used for different system environments and a header object 221 associated with the respective pieces of program code are stored in advance. The host device 1 obtains the header object 221 from the target device 2, and then parses the obtained header object 221 to determine program code 23x (x is one of 1 through n) optimal for its own system environment. The host device 1 then uploads the determined program code 23x from the target device 2 for interpretation, thereby controlling the target device 2.

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