To provide a portable communication terminal capable of increasing profits of a company related to sales of a portable communication terminal or improving the convenience of a user by inexpensively and simply attaching a new convenience function to the existing portable communication terminal.

The portable communication terminal 1 provided with a microphone 2 is provided with signal detecting means 42 and 43 for detecting a specific signal in a specific frequency band from an output of the microphone 2, and a specific processing means 44 for performing specific processing including processing for notifying the occurrence of a specific event when the specific signal is detected from the signal detecting means 42 and 43.