Disclosed is a data processing device including: at least one processor that executes a program stored in at least one memory; and a timer that repeatedly and continuously counts a setting time. The processor acquires data indicating a battery state, judges occurrence of an event, executes processing based on data acquired in the setting time when judging that the event has not occurred between start and end of counting for one setting time, and executes at least one of a first operation of performing the processing based on data from the counting start to a stop timing based on the event occurrence and a second operation of performing the processing based on data from a start timing based on an event occurrence timing to end of counting for one setting time when judging that the event has occurred between the start and the end of the counting.