An auxiliary positioning method, applied to a portable electronic device operative in a wireless communication network system and a satellite positioning system, for determining current position information of the potable electronic device, includes steps of receiving a plurality of current signals from at least one base station in the wireless communication network system to generate current signal information; accessing at least one track record related to the current signal information from a track record database, wherein the track record database includes a plurality of track records which record respective position information and signal information of base stations corresponding to the position information; and calculating the current position information according to the at least one track record.