To predict a voltage value in the case of performing a task without conducting a pseudo-operation.
A voltage change predicting means 60 receives notification from an input task notifying means 44 and calculates, as a prediction voltage value, a difference between a voltage value detected by a battery state detecting part 4 and the voltage value being reduced when a subsequent performance candidate task is performed, which is acquired by referring to a task power consumption characteristic table 50, When the prediction voltage value is lower than a power saving mode changeover threshold voltage value and higher than a power source off mode changeover threshold voltage value, a mask signal is output to a mode changeover mask part 30 so as not to changeover a mode into a power saving mode.
COPYRIGHT: (C)2005,JPO&NCIPI
Kenichi Kawaguchi
Masakazu Urade
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Kimihide Hashimoto
Toshimitsu Ichikawa