A flow line creation section generates flow line data indicative of a trajectory of a customer moving in a monitored area. The generated flow line data is stored in a flow line database. A customer extraction section extracts image data including the customer's face image from a video captured by a camera. The extracted image data is stored in a customer image database. A matching section matches the flow line data stored in the flow line database individually with the image data including the customer's face image corresponding to the flow line data, out of the image data stored in the customer image database. Data indicative of a correlation between the matched flow line data and image data is stored in a matching list database.