RECOMMENDER AND MEDIA RETRIEVAL SYSTEM THAT RECORD GROUP INFORMATION

A recommender system provides recommendation scores based on stored ratings for media items, for example to assist control of selection of a media item for rendering by a terminal. Data representing stored rating values for media items is stored in a storage system for use to compute the recommendation scores. A processing system records an input rating value for a first one of the media items in the storage system, based on measured activity or input of a user. Furthermore information is acquired about a group of users in the company of which the input rating value applies for the user. This information is recorded in combination with the rating value. The processing system may compute a recommendation score for a second group of users from the stored rating values, dependent on a comparison of the second group of users and the recorded information about the group.