Electronic Device and Log Application

An electronic device including a platform that provides an application program interface (API), the API being called by an application, the electronic device comprising:

• a recording medium storing a log application that stores a log of
• changes of an internal state in the electronic device, and
• changes of an API call as a calling of the API by the application;
• wherein
• the platform causes the electronic device to achieve a change notification unit, the change notification unit notifying the log application of the changes of the internal state and the changes of the API call;
• the changes of the internal state and the changes of the API call are classified in a plurality of categories;
• the log application causes the electronic device to achieve a log storage unit, the log storage unit storing the changes of the internal state and the changes of the API call as the log, the changes of the internal state and the changes of the API call being notified by the change notification unit;
• and
• the log storage unit stores the changes of the internal state and the changes of the API call of only one category among the plurality of categories as the log.