To provide a security system capable of heightening the effect of deterring a crime and realizing high-grade security.

A release detecting part 24 detects that a locking device disposed in an entrance door 1 is released according to a detection signal from a locking release sensor 12. A fingerprint comparing part 23 compares the fingerprint data input from a fingerprint sensor 11 disposed on a door knob to a fingerprint input part 21 with fingerprint data of a specified person previously registered in a fingerprint storing part 22 at a fingerprint comparing part 23. When a match is found in the fingerprint data, an electronic lock 13 is also released to open the entrance door 1. If no match is found in the fingerprint data, the report is sent with the time and date clocked by a clocking part 25 and identification information of a home computer to a security company computer 3 through a telephone line 4. The reported data on the time and date is stored in a storage part 27.