There is provided an information processing apparatus for detecting a foreground portion from an acquired image. Feature amount information of a past acquired image and likelihood information indicating a probability that a subject is represented is stored as background model information. A foreground region is detected based on the likelihood information and a result of comparing the feature amount extracted from the acquired image with the feature amount information contained in the background model information. For each of the detected foreground region, a likelihood indicating a probability that the region represents the subject is calculated based on information prepared in advance related to the subject.