Abstract: A portable wireless terminal provides a signal output circuit for outputting an audio signal to a speaker or to earphones from an earphone jack via a plug, and a controller for controlling the signal output circuit to output an arbitrary audio signal or another audio signal to the speaker and/or the earphones at an arbitrary timing when the audio signal is being outputted to the speaker and/or the earphones. Thereby, an audio signal can be outputted to the desired speaker and/or the earphones that have been arbitrary selected by switching the signal output circuit without pulling the plug out of the earphone jack when the audio signal is being outputted to the speaker and/or the earphones.

Abstract: This invention improves the usability of a portable wireless terminal. According to this invention, a portable wireless terminal provides signal output means 49 for outputting an audio signal to a speaker 6 or to earphones 25 from an earphone jack 16 via a plug 21, and control means 40 for controlling the signal output means 49 to output an arbitrary audio signal or another audio signal to specified speaker 6 and/or earphones 25 at an arbitrary timing when the arbitrary audio signal is being outputted to the speaker 6 and/or earphones 25. Thereby, an audio signal can be outputted to desired speaker 6 and/or earphones 25 that have been arbitrary selected by switching the output means to them without pulling the plug 21 out of the earphone jack 16 when the audio signal is being outputted to the speaker 6 and/or the earphones 25. Thus, the usability of a portable wireless terminal 1 can be improved.

Abstract: To use logging areas with no empty spacing left and trace back the logs to the past, a logging system is provided. Information to be logged includes data and management information managing the data. The logging system comprises memory having a management area and a data area, and a writing element for writing not only management information into the management area with a fixed length but also data into at least one of the data area and the management area. The writing element comprises a member for writing the management information about the data to be written in the data area into the management area with the fixed length and a member for sequentially writing the data into the data area with variable lengths according to the management information.