Method of automatic plug and play for device using real time device application download and device therefor

A terminal interworking method with real-time terminal application download and a terminal interworking device are disclosed. The present invention comprises a step of obtaining the device identification information of a terminal in which a legacy terminal is connected in an M2M objective; a step of obtaining device application information corresponding to device identification information through a device application information management server; a step of obtaining device application information corresponding to device identification information through a device application information management server; a step of determining the installation state of the device application corresponding to the device application information in the M2M object; and a step of obtaining the device application from a device installation file management server corresponding to the device identification information when the device application corresponding to the device identification information is not installed. [Reference numerals] (315) DecID-DA URL-DA version;(320) DA installation file management server;(321) DevID-DA version-DA installation file;(330) M2M server platform (NSCL);(414) DA ID-DA version-installation result