LAS-Checker provides useful security services needed for those currently in charge of security. In other words, until now when a visitor carries in a laptop computer, the hardware of the laptop computer has been checked manually by the existing system. In many cases, even this kind of inspection system is hardly available. However, within a 10-second period, LAS-Checker can collect and compare, ‘the information stored in the laptop computer at the entry’ and ‘the information stored at the exit’, and detect what changes have been made in the laptop computer so that security managers can take proper security measures immediately.