System for sharing hsm(hardware security module) of mobile unit using nfc

PURPOSE: An external hardware security module (HSM) sharing system of a mobile device which supports a near field communication (NFC) is provided to perform a certification process through an external HSM which is connected to the mobile device through the NFC without including an HSM inside of the mobile device. CONSTITUTION: A mobile device (100) receives certification login request information. The mobile device is connected to an HSM (200) by activating an NFC module (110). The mobile device reads out a certification which is stored in the HSM by a control of an HSM driving module (120). The HSM is comprised in a form of card or accessory. The HSM includes a certification. The HSM performs an NFC with the mobile device by being equipped with a radio frequency function.