An entry and exit control apparatus wherein missing entry and exit information on a user entering and exiting a controlled area by tailgating is complemented by entry and exit information on another user presumed to enter and exit the controlled area along with the user that is tailgating. Therefore, reliability of user entry and exit history is improved to sufficiently suppress a decrease in security in the controlled area. The entry and exit control apparatus estimates entry and exit date and time concerning the missing entry and exit information based on the statistically processed staying time information of the user and the traveling time information for the entry and exit date information of the user determined that a missing item is generated, extracts complementary entry and exit information from pieces of entry and exit information stored in an entry and exit history DB based on the estimated entry and exit date and time, and complements the missing entry and exit information on the user using the extracted complementary entry and exit information.