1. A lifelog recording system that records, as a piece of lifelog data, life information of a user, the system comprising: a lifelog data obtaining section, which is configured to obtain the piece of lifelog data from an action of the user; an emotion level estimating section, which is configured to estimate an emotion level, which is a quantified emotion state of the user, based on at least one of a result of monitoring the action by the user and a biometric signal obtained by a biometric sensor; a memory device, which is configured to store the piece of lifelog data; a data-to-be-recorded generating section, which is configured to generate a piece of data-to-be-recorded by associating the emotion level of the user, which is estimated through the emotion level estimating section, with the piece of lifelog data, which is obtained through the lifelog data obtaining section; and a log managing section, which is configured to manage whether the piece of data-to-be-recorded should be stored in the memory device based on a selectivity based on the associated emotion level.