A reference image acquisition unit (171) obtains a reference image for guiding a portable device (1) to a position in which near field wireless communication with a terminal device (2) is possible on the basis of portable device identification information for identifying a type of the portable device (1). A reference image display control unit (172) displays the reference image obtained by the reference image acquisition unit (171) on a display unit (12) provided on an opposite surface of the portable device (1) to a surface that opposes the terminal device (2) when the portable device (1) is brought close to the terminal device (2). A reference image correction unit (173) corrects a position of the reference image in response to an image moving operation for aligning the reference image displayed on the display unit (12) with a target mark formed on a front surface of the terminal device (2).