A portable device comprising: a photographing unit provided in a rear of a casing of the portable device; a communication unit configured to transmit an image obtained through photographing by the photographing unit to another portable device managed in association with the portable device each time when photographing is performed, and configured to receive the image transmitted from the other portable device each time when photographing is performed in the other portable device; a display unit provided in a front of the casing of the portable device and configured to display the image transmitted from the other portable device and received by the communication unit; a storage unit configured to store the image obtained through photographing by the photographing unit and the image received by the communication unit; characterized in that it further comprises: a detection unit configured to detect whether a user touches any opposed sides of top and bottom sides and left and right sides of the casing and whether a depression operation of opposed sides by the user is performed; and a display control unit configured to select the image received last by the communication unit from among the images stored in the storage unit and to cause the display unit to display the selected image depending on a fact that it is detected that a user touches a side of the casing. a photographing unit provided in a rear of a casing of the portable device; a communication unit configured to transmit an image obtained through photographing by the photographing unit to another portable device managed in association with the portable device each time when photographing is performed, and configured to receive the image transmitted from the other portable device each time when photographing is performed in the other portable device; a display unit provided in a front of the casing of the portable device and configured to display the image transmitted from the other portable device and received by the communication unit; a storage unit configured to store the image obtained through photographing by the photographing unit and the image received by the communication unit; characterized in that it further comprises: a detection unit configured to detect whether a user touches any opposed sides of top and bottom sides and left and right sides of the casing and whether a depression operation of opposed sides by the user is performed; and a display control unit configured to select the image received last by the communication unit from among the images stored in the storage unit and to cause the display unit to display the selected image depending on a fact that it is detected that a user touches a side of the casing. a detection unit configured to detect whether a user touches any opposed sides of top and bottom sides and left and right sides of the casing and whether a depression operation of opposed sides by the user is performed; and a display control unit configured to select the image received last by the communication unit from among the images stored in the storage unit and to cause the display unit to display the selected image depending on a fact that it is detected that a user touches a side of the casing.