A marketing system comprising: a first communication part being provided to a user terminal owned by a user, and being configured to send radio wave including the terminal ID of the user terminal regularly; a second communication part being provided to a Wi-Fi sensor installed in a specific area, and being configured to receive radio wave sent by the user terminal of the user who entered in the area; a transmission part being provided to the Wi-Fi sensor, and being configured to transmit communication information including the terminal ID of the user terminal, the unit ID of the Wi-Fi sensor and radio wave intensity to a server through a network, the radio wave intensity being the intensity of the radio wave and meaning a proximity sorted for plural stages depending on the distance between the user terminal and the Wi-Fi sensor when the user terminal performs short-distance wireless communication to the Wi-Fi sensor through the radio wave; a collection part being provided to the server, and being configured to collect a chronological change of the radio wave intensity for the terminal ID of the communication information concerned with the unit ID of the communication information when receiving the communication information; a calculation part being provided to the server, and being configured to draw a circle or a ring of which a radius is the distance corresponding to the radio wave intensity on the center of the Wi-Fi sensor of the unit ID virtually based on the collected radio wave intensity for the terminal ID concerned with the unit ID, to calculate position information on the circle or the ring as a part of the flow line on which the user moved, and to calculate the flow time when the user stays on the part of the flow line based on the chronological change of the radio wave intensity; and an estimation part being provided to the server, and being configured to estimate user's action information indicating what the user did actually on the area of the Wi-Fi sensor of the unit ID based on the part of the flow line and the flow time; the marketing system being characterized in that it further comprises an analysis part being provided to the server, and being configured to analyze user's attribute information including user's preference based on the estimated user's action information and installation attribute information indicating the attribute of the installation of the Wi-Fi sensor, the installation attribute information pre-provided with the unit ID of the Wi-Fi sensor. a first communication part being provided to a user terminal owned by a user, and being configured to send radio wave including the terminal ID of the user terminal regularly; a second communication part being provided to a Wi-Fi sensor installed in a specific area, and being configured to receive radio wave sent by the user terminal of the user who entered in the area; a transmission part being provided to the Wi-Fi sensor, and being configured to transmit communication information including the terminal ID of the user terminal, the unit ID of the Wi-Fi sensor and radio wave intensity to a server through a network, the radio wave intensity being the intensity of the radio wave and meaning a proximity sorted for plural stages depending on the distance between the user terminal and the Wi-Fi sensor when the user terminal performs short-distance wireless communication to the Wi-Fi sensor through the radio wave; a collection part being provided to the server, and being configured to collect a chronological change of the radio wave intensity for the terminal ID of the communication information concerned with the unit ID of the communication information when receiving the communication information; a calculation part being provided to the server, and being configured to draw a circle or a ring of which a radius is the distance corresponding to the radio wave intensity on the center of the Wi-Fi sensor of the unit ID virtually based on the collected radio wave intensity for the terminal ID concerned with the unit ID, to calculate position information on the circle or the ring as a part of the flow line on which the user moved, and to calculate the flow time when the user stays on the part of the flow line based on the chronological change of the radio wave intensity; and an estimation part being provided to the server, and being configured to estimate user's action information indicating what the user did actually on the area of the Wi-Fi sensor of the unit ID based on the part of the flow line and the flow time; the marketing system being characterized in that it further comprises an analysis part being provided to the server, and being configured to analyze user's attribute information including user's preference based on the estimated user's action information and installation attribute information indicating the attribute of the installation of the Wi-Fi sensor, the installation attribute information pre-provided with the unit ID of the Wi-Fi sensor.