This invention comprises an imaging element comprising an imaging layer having associated therewith a phenolic activating agent in combination with a blocked color-forming agent of Structure I: . The method of the present invention includes: managing an update history on the basis of guidance information included in a map, receiving the map update information included in search information in real time, reconstructing path guidance information of a terminal, and performing exact guidance on the terminal with search path information transmitted from the server. The polarizer, according to the invention, consists of at least two polarizers, at least one of which is the E-type polarizer and at least one is the O-type polarizer. The evaluation is performed based on pulse wave intensities of the respective measurement channels calculated by a pulse wave calculation unit.