Patent ID: 8849792

Claim:
An information management method to be executed by a computer, the information management method comprising: accepting a registration request that includes identification information of a mobile device, and position information of the mobile device that includes latitude and longitude; generating a value that includes the identification information followed by information that indicates a date and time when the registration request is accepted; storing the position information in a first storage unit associated with the value as a first key; generating another value that includes the information that indicates the date and time followed by the identification information; storing the position information in a second storage unit associated with the other value as a second key; storing the position information in a third storage unit associated with the identification information as a third key; and storing the identification information in a fourth storage unit associated with the position information as a fourth key; accepting a search request in which there is specified at least one of latitude to be searched and longitude to be searched, information indicating time, and the identification information; selecting, by the computer, a search destination from the first storage unit, the second storage unit, the third storage unit, and the fourth storage unit based on the search request; and searching for the search destination based on the search request, wherein the first storage unit is selected as the search destination when the information indicating time, and the identification information are specified in the search request, wherein the second storage unit is selected as the search destination when the information indicating time is specified, and also the identification information is not specified in the search request, wherein the third storage unit is selected as the search destination when the identification information is specified, and also the information indicating time is not specified in the search request, and wherein the fourth storage unit is selected as the search destination when the latitude to be searched and the longitude to be searched are specified in the search request.