Abstract: A sharing management method for sharing a terminal with plural users includes: after completion of login to an operating system of the terminal or after booting up the operating system, starting to record log data for predetermined events; and after the completion of the login to the operating system or after booting up said operating system, prohibiting an operation other than predetermined operations including user authentication in a sharing management program, wherein the user authentication is other than authentication in the operating system. Then, the log data after the user authentication succeeded includes a user identifier in the sharing management program, which relates to a user whose user authentication succeeded. As a result, while ensuring the security in the terminal apparatus shared by plural users, it is possible to rapidly carry out user switching.

Abstract: An amplifier circuit easily suppresses an intermodulation distortion signal incident to amplification. An input signal is class A amplified to be times stronger on a path of a first amplifier 102, resulting in an input signal component F1 and F2 of power F, and intermodulation distortion signal components (2F1-F2) and (2F2-F1) of power Fk1. The input signal is class AB amplified to be À times (>À) stronger on a path of a second amplifier 103, resulting in an input signal component F1 and F2 of power ÀF, and intermodulation distortion signal components (2F1-F2) and (2F2-F1) of power Fk2. A combiner 104 combines the input signal component F1 and F2 of power F and the intermodulation distortion signal components (2F1-F2) and (2F2-F1) of power Fk1 with the input signal component F1 and F2 of power ÀAF and the intermodulation distortion signal components (2F1-F2) and (2F2-F1) of power Fk2.

Abstract: A sharing management method for sharing a terminal with plural users includes: after completion of login to an operating system of the terminal or after booting up the operating system, starting to record log data for predetermined events; and after the completion of the login to the operating system or after booting up said operating system, prohibiting an operation other than predetermined operations including user authentication in a sharing management program, wherein the user authentication is other than authentication in the operating system. Then, the log data after the user authentication succeeded includes a user identifier in the sharing management program, which relates to a user whose user authentication succeeded. As a result, while ensuring the security in the terminal apparatus shared by plural users, it is possible to rapidly carry out user switching.