A portable electronic apparatus that is disposed to a portable terminal device includes a contactless communication unit, the apparatus comprises a first interface which performs communication with the portable terminal device a second interface which performs contactless communication by using the contactless communication unit a storage unit which stores a plurality of application programs that execute processing in the contactless communication using the contactless communication unit through the second interface a setting unit which sets an application program capable of responding to an access request in the contactless communication in the plurality of application programs stored in the storage unit and a processing unit by which the application program enabled to respond to the access request in the contactless communication by the setting unit alone responds upon receiving the access request in the contactless communication through the second interface.