Disclosed is a water purifier. The water purifier includes a water quality sensor configured to measure quality of water that is suppled from a water supply source, a first filter configured to filter by a first method, a second filter configured to filter by a second method, a flow path shifting valve configured to selectively supply water that is supplied from the water supply source to the first filter or the second filter, and a processor configured to control the flow path shifting valve based on a water quality value that is measured by the sensor.