Method for selecting base station

A wireless communication system in which a terminal has means for selecting one base station from a plurality of base stations with which the terminal is to wirelessly communicate, said wireless communication system comprising:

• a plurality of wireless base stations classified into a plurality of groups;
• and
• a wireless terminal to be connected to one of said plurality of wireless base stations,
• wherein an index of communication quality between said wireless terminal and the wireless base stations is obtained for each of said base stations, characterizing quantities of the communication quality are calculated for each of the groups, one of the plurality of groups is specified based on the characterizing quantities, and one of the wireless base stations of the specified group is selected as a connection destination base station of the wireless terminal.