exists an existence notice signal reception unit 12 which receives an existence notice signal transmitted from the terminal authentication module 2 in response to the existence confirmation signal a link connection unit 13 which establishes a wireless link with the terminal authentication module 2 that has transmitted the existence notice signal and a first authentication unit 14 which conducts first authentication with the terminal authentication module 2 via the wireless link furthermore the terminal authentication module 2 includes an existence confirmation signal reception unit 21 which receives the existence confirmation signal an existence notice signal transmission unit 22 which transmits the existence notice signal in response to the existence confirmation signal a link connection unit 23 which establishes a wireless link with the portable information terminal 1 after the existence notice signal has been received by the portable information terminal 1 a second authentication unit 24 which conducts the first authentication with the portable information terminal 1 via the wireless link and a control command transmission unit 25 which transmits a control command to the entry terminal 3 when the first authentication has succeeded the entry terminal 3 includes a control command reception unit 31 which receives the control command and an entry unit 32 which executes predetermined entry operation on the basis of the control command here.