To make quickly and automatically selectable an application in accordance with a used information transmitting means by discriminating the information transmitting means being used.

A portable information processor (1) provided with a plurality of information transmitting means (2 to 5) for communicating with the outside is provided with an identifying means (6) for detecting which information transmitting means information is transmitted through, and a controlling means (7) for referring to a default application management table that sets correspondence between the information transmitting means and default applications, acquiring default application information corresponding to the information transmitting means detected by the identifying means and selecting the default application.