A store surveillance system, a warning device, a store surveillance system control method, and a program enable easily detecting fraudulent activity in a retail store, supermarket, or other type of store. A store management server 5 has a pattern storage unit T that stores occurrence patterns of specific events that occur in a store; a POS terminal 1 that executes a product transaction process; a employee surveillance camera 3 that monitors component factors of the occurrence patterns; and a card reader 4. When the POS terminal 1 executes a predetermined exception process, the store management server 5 issues a warning conditionally upon whether event occurrence conditions detected by the employee surveillance camera 3 and card reader 4 match a fraudulence pattern stored as an occurrence pattern, or do not match a normal pattern stored as an occurrence pattern.