To receive content services from a content server accepted in an Internet via a GW (GateWay) unit by a mobile user terminal connected to a mobile communication network, a plurality of GW units are located in respective predetermined areas. A part of radio communication base stations to be the mobile communication network connects an access request to the content server accepted in the Internet with a predetermined GW unit. When the mobile user terminal moves from a first area to a second area, roaming service is executed among the radio communication base stations in the mobile communication network, the mobile user terminal is connected to a second GW unit, an inquiry is issued to another GW unit, roaming service is executed among GW units, and thereby content services are continued for the moving mobile user terminal.