A portable electronic device includes: a communication block configured to communicate with another portable electronic device different from said portable electronic device; an information acquisition block configured to acquire relation information that is information about a relation between a user of said portable electronic device and a user of said other portable electronic device from an external server through a network when said communication block communicates with said other electronic device; and a notification block configured to notify the user of said portable electronic device of the relation information acquired by said information acquisition block.