A control method executed by an information processing device and a wearable device, the information processing device having a function of wirelessly communicating with the wearable device and a locking function of restricting operation of the information processing device, the control method comprising: establishing (S401; S602) a wireless communication between the information processing device and the wearable device when the wearable device approaches the information processing device and a distance between the information processing device and the wearable device becomes within a predetermined range; transmitting (S403; S503; S603; S703), to the wearable device, a first request for acquiring second acceleration information of the wearable device by a second acceleration sensor when an acceleration of the information processing device is detected before detecting an operation to start use of the information processing device; acquiring (S405; S504; S605; S704) first acceleration information of the information processing device by a first acceleration sensor and first time information indicating a time at which the first acceleration information is stored in a first memory; determining (S505; S705) whether the operation to start use of the information processing device is detected within a predetermined time period; transmitting (S407; S507; S607; S707) a second request for transmitting the second acceleration information of the wearable device when it is determined that the operation is detected within the predetermined time period; receiving (S408; S608) from the wearable device, in response to the second request, the second acceleration information and second time information indicating a time at which the second acceleration information is stored in a second memory; determining (S409; S510; S609; S710) that the first acceleration information corresponds to the second acceleration information when a correlation between the first acceleration information and the second acceleration information is greater than or equal to a predetermined threshold and the first time information matches the second time information; and releasing (S410; S511; S610; S711) locking of the information processing device when it is determined that the first acceleration information corresponds to the second acceleration information. establishing (S401; S602) a wireless communication between the information processing device and the wearable device when the wearable device approaches the information processing device and a distance between the information processing device and the wearable device becomes within a predetermined range; transmitting (S403; S503; S603; S703), to the wearable device, a first request for acquiring second acceleration information of the wearable device by a second acceleration sensor when an acceleration of the information processing device is detected before detecting an operation to start use of the information processing device; acquiring (S405; S504; S605; S704) first acceleration information of the information processing device by a first acceleration sensor and first time information indicating a time at which the first acceleration information is stored in a first memory; determining (S505; S705) whether the operation to start use of the information processing device is detected within a predetermined time period; transmitting (S407; S507; S607; S707) a second request for transmitting the second acceleration information of the wearable device when it is determined that the operation is detected within the predetermined time period; receiving (S408; S608) from the wearable device, in response to the second request, the second acceleration information and second time information indicating a time at which the second acceleration information is stored in a second memory; determining (S409; S510; S609; S710) that the first acceleration information corresponds to the second acceleration information when a correlation between the first acceleration information and the second acceleration information is greater than or equal to a predetermined threshold and the first time information matches the second time information; and releasing (S410; S511; S610; S711) locking of the information processing device when it is determined that the first acceleration information corresponds to the second acceleration information.