Indoor wireless positioning system and indoor wireless positioning method

Performing a prediction signal attenuation due to the floor or wall in a multi-story building and discloses an indoor wireless positioning system and indoor wireless positioning means to positively perform an indoor wireless positioning more. Indoor wireless positioning method calculates the layer and calculating the inter-loss information with the located user terminal layer and the upstairs and downstairs in the building and compares the pre-stored dictionary interlayer loss information and the calculated inter-loss information within the user terminal and, since the layer is located the user terminal calculates the information on between walls loss, and obtain location information on the horizontal plane of the user terminal according to the information about the received signal strength and the between walls loss of the user terminal, when the position detection of the user terminal improve its accuracy and is more efficient wireless positioning possible.