An image data obtaining unit (102) obtains image data picked up by an image-pickup device. An identification information obtaining unit (101) obtains identification information of a device that is wirelessly communicated when the image data is obtained. An image data memory unit (104) stores, in association with each other, the obtained image data and the identification information obtained when the image data is obtained. The identification information obtaining unit (101) obtains the identification information of the device wirelessly communicated at a predetermined timing after the image data memory unit (104) stores the image data and the identification information in association with each other. A searching unit (106) searches image data associated with the obtained identification information among pieces of the image data stored in the image data memory unit (104). A display control unit (107) displays the searched image data on a display unit.