A position information processing method includes: measuring, at a communication apparatus, a signal intensity of a signal transmitted from a plurality of base stations; recording a history of signal intensity information at one or more times in a history storage medium of the communication apparatus; recording, in an information storage medium of the information recording apparatus, a specific time and information matching a position environment of the information recording apparatus at the specific time, respectively correlated to each other; calculating position information of the communication apparatus based on the history of signal intensity information recorded in the history storage medium, and known base station information constituted of the base station identification information and position information of the base stations; and correlating the calculated position information to the information matching the position environment stored in the medium and correlated to the specific time.