A terminal information acquisition unit 11 acquires information including position information of a portable terminal 10, direction information in which the portable terminal 10 faces, and terminal posture information of the portable terminal 10. A camera unit 12 generates a camera image obtained by taking an image of surrounding. A depiction history calculation unit 14 calculates activity history depiction information to be displayed based on an activity history acquired in advance and an image-taking range of the camera unit 12. An image combining unit 15 generates a composite image in which the activity history depiction information is depicted on the camera image. A display unit 16 display the composite image generated by the image combining unit 15.
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