A mobile terminal comprising: communication means for performing data communication per a fixed time length; mode setting information obtaining means for obtaining, via said communication means, predetermined mode setting information notified from a base station end; free time generation processing means for generating a free time interval at which no data communication is performed in said fixed time length and performing a predetermined processing in the free time interval, by compressing intervals at which data communication is performed in said fixed time length based on said predetermined mode setting information obtained by said mode setting information obtaining means; judging means for judging whether communication quality during data communication by said communication means is not less than a preset predetermined communication quality; and control means that is adapted to, in a case where said predetermined mode setting information is obtained by said mode setting information obtaining means and data communication is performed by said communication means, control said free time generation processing means to generate the free time interval and to perform the other predetermined processing in the free time interval and also to control said communication means to temporarily stop data communication, when said judging means judges that the communication quality is under the predetermined communication quality, characterised in that the control means is operable to control said free time generation processing means not to generate the free time interval and not to perform said other predetermined processing, and also to control said communication means to continue performing data communication when said judging means judges that the communication quality detected by said detecting means is not less than the predetermined communication quality. communication means for performing data communication per a fixed time length; mode setting information obtaining means for obtaining, via said communication means, predetermined mode setting information notified from a base station end; free time generation processing means for generating a free time interval at which no data communication is performed in said fixed time length and performing a predetermined processing in the free time interval, by compressing intervals at which data communication is performed in said fixed time length based on said predetermined mode setting information obtained by said mode setting information obtaining means; judging means for judging whether communication quality during data communication by said communication means is not less than a preset predetermined communication quality; and control means that is adapted to, in a case where said predetermined mode setting information is obtained by said mode setting information obtaining means and data communication is performed by said communication means, control said free time generation processing means to generate the free time interval and to perform the other predetermined processing in the free time interval and also to control said communication means to temporarily stop data communication, when said judging means judges that the communication quality is under the predetermined communication quality, characterised in that the control means is operable to control said free time generation processing means not to generate the free time interval and not to perform said other predetermined processing, and also to control said communication means to continue performing data communication when said judging means judges that the communication quality detected by said detecting means is not less than the predetermined communication quality.