Patent ID: 7498773

Claim:
An information terminal driven by a battery, comprising: a data storage configured to be driven upon receiving a supply of a power source from the battery, data being stored in the data storage; a voltage detector configured to detect a battery voltage which is a voltage of the battery; a battery remaining capacity calculator configured to calculate a battery remaining capacity based on the battery voltage, the battery remaining capacity calculator calculating the battery remaining capacity after access to the data storage is completed; and a load calculator configured to calculate a load on the battery of the data storage, wherein: the battery remaining capacity calculator calculates the battery remaining capacity corrected based on the load calculated by the load calculator, the data storage has at least a first operating state and a second operating state when the data storage is not accessed, a first current consumption of the first operating state being lower than an accessing current consumption in which the data storage is accessed and a second current consumption of the second operating state being lower than the first current consumption of the first operation state, and the load calculator finds a load of the data storage based on a period of time in the first operating state and a period of time in the second operating state when the data storage is not accessed, and whether the data storage is in the first operating state or the second operating state when the data storage is not accessed is determined based on duration in which the data storage has not been accessed.