A location model updating apparatus updates a location model based on data uploaded from a mobile terminal. A certainty of data observed at a location having a location name designated by a user is computed based on a previous histogram, for each most recent check-in data uploaded during a time from previous to current histogram updating, and a most recent histogram is generated based on the certainty. The location is detected using the previous histogram, based on a received signal strength included in each most recent check-in data, in order to judge whether the check-in data is correct, depending on whether a location name of the detected location matches the location name designated by the user and included in each most recent check-in data.