Portable terminal device and information processing method

The portable terminal device includes: a sound output unit that outputs sound; an operation input unit that receives an operation input by a user; one or more motion sensors for detecting the motion of the device body; and a control unit that determines the measurement sound output from the sound output unit in an evaluation process for evaluating the support state of the acoustic device, on the basis of the operation detected by the operation sensor when the operation input is performed on the operation input unit. 便携终端装置包括:声音输出部，输出声音；操作输入部，接收用户的操作输入；一个以上的动作传感器，检测装置主体的动作；以及控制部，根据对所述操作输入部进行操作输入时的由所述动作传感器检测出的动作，在评价音响装置的支撑状态的评价处理中，决定从所述声音输出部输出的测量音。