1. A terminal selection method based on a self-organizing network (SON), the method comprising: determining, by a SON algorithm entity, a terminal selection criterion under a requirement of implementing different SON algorithms; performing, by the SON algorithm entity, target terminal selection from terminals managed by the SON algorithm entity according to the terminal selection criterion; and wherein the terminal selection criterion indicates that a random selection method is used to randomly select a number of target terminals from terminals managed by the SON algorithm entity or randomly select a number of target terminals from a cell on which a SON algorithm is performed.