A portable terminal comprising: a reader that reads identification information of an RFID tag from the RFID tag; a position information detector that detects position information of the portable terminal; and a direction information detector that detects direction information of the portable terminal, characterized in that the portable terminal comprises: a storage controller that performs, upon reading of identification information of the RFID tag by the reader, acquisition of a reading direction of the reader from direction information detected by the direction information detector at the time of the reading of the identification information of the RFID tag, and storage, in a storage unit, of (i) position information detected by the position information detector at the time of the reading of the identification information of the RFID tag and (ii) the acquired reading direction information as (i) reading position and (ii) reading direction, so as to be correlated with the identification information of the RFID tag; and a notification controller that acquires the reading direction of the reader from direction information detected by the direction information detector, and causes a notification unit to make notification of guide information indicating the reading position and the reading direction stored in the storage unit with respect to position information detected by the position information detector and the acquired reading direction. a reader that reads identification information of an RFID tag from the RFID tag; a position information detector that detects position information of the portable terminal; and a direction information detector that detects direction information of the portable terminal, characterized in that the portable terminal comprises: a storage controller that performs, upon reading of identification information of the RFID tag by the reader, acquisition of a reading direction of the reader from direction information detected by the direction information detector at the time of the reading of the identification information of the RFID tag, and storage, in a storage unit, of (i) position information detected by the position information detector at the time of the reading of the identification information of the RFID tag and (ii) the acquired reading direction information as (i) reading position and (ii) reading direction, so as to be correlated with the identification information of the RFID tag; and a notification controller that acquires the reading direction of the reader from direction information detected by the direction information detector, and causes a notification unit to make notification of guide information indicating the reading position and the reading direction stored in the storage unit with respect to position information detected by the position information detector and the acquired reading direction. a storage controller that performs, upon reading of identification information of the RFID tag by the reader, acquisition of a reading direction of the reader from direction information detected by the direction information detector at the time of the reading of the identification information of the RFID tag, and storage, in a storage unit, of (i) position information detected by the position information detector at the time of the reading of the identification information of the RFID tag and (ii) the acquired reading direction information as (i) reading position and (ii) reading direction, so as to be correlated with the identification information of the RFID tag; and acquisition of a reading direction of the reader from direction information detected by the direction information detector at the time of the reading of the identification information of the RFID tag, and storage, in a storage unit, of (i) position information detected by the position information detector at the time of the reading of the identification information of the RFID tag and (ii) the acquired reading direction information as (i) reading position and (ii) reading direction, so as to be correlated with the identification information of the RFID tag; and a notification controller that acquires the reading direction of the reader from direction information detected by the direction information detector, and causes a notification unit to make notification of guide information indicating the reading position and the reading direction stored in the storage unit with respect to position information detected by the position information detector and the acquired reading direction. acquires the reading direction of the reader from direction information detected by the direction information detector, and causes a notification unit to make notification of guide information indicating the reading position and the reading direction stored in the storage unit with respect to position information detected by the position information detector and the acquired reading direction.