To control a device connected to an information processor through a network.

When the device 51-1 is connected through a cord 101-1-1, the automatic recognition part 31-1 of this information processor 21-1 acquires a device identifier 51-1A for identifying the device 51-1. At the time, the information processor 21-1 activates a device control program 33-1-1 for controlling the operation of the device 51-1. In a data base 32-1, as the device information 61-1-1 of the device 51-1, the device identifier 51-1A and the reference (information for performing access) of the device control program 33-1-1 are stored. A node 22-1 reads the device information 61-1-through the network 23, accesses the device control program 33-1-1 through the reference of the device control program 33-1-1 and controls the device 51-1.