Abstract: A mobile terminal device includes: a housing; a measuring unit configured to measure an air pressure inside the housing; a detecting unit configured to detect whether the housing is sealed based on a change in the air pressure measured by the measuring unit while an operation is being conducted by a user; and a notifying unit configured to notify the user of a detection result of the detecting unit.

Abstract: A mobile terminal device includes: a housing; a measuring unit configured to measure an air pressure inside the housing; a detecting unit configured to detect whether the housing is sealed based on a change in the air pressure measured by the measuring unit while an operation is being conducted by a user; and a notifying unit configured to notify the user of a detection result of the detecting unit.

Abstract: In a mobile communication terminal according to an aspect of the invention, it is detects whether an external unit is connected to an earphone jack. If it is detected that an external unit is connected to the earphone jack, it is determined whether the external unit is an earphone unit or an electronic flash unit. If the external unit is the electronic flash unit, an audio path provided in the terminal to transmit an audio signal within the terminal will be connected to a microphone and a speaker provided in the terminal.

Abstract: In a mobile communication terminal according to an aspect of the invention, it is detects whether an external unit is connected to an earphone jack. If it is detected that an external unit is connected to the earphone jack, it is determined whether the external unit is an earphone unit or an electronic flash unit. If the external unit is the electronic flash unit, an audio path provided in the terminal to transmit an audio signal within the terminal will be connected to a microphone and a speaker provided in the terminal.

Abstract: There is comprised an electronic flash unit having a light emitting section. A request for implementing control accompanying radio communication is monitored while a request for applying a charging voltage or a light-emission drive current to the electronic flash unit is monitored. The radio communication or the application of the charging voltage or light-emission drive current, or both are controlled on the basis of the results of monitoring, to prevent the radio communication and the application of the charging voltage from overlapping in time.