A Study to Evaluate Response of Overactive Bladder Symptom Score (OABSS) to Treatment

Inclusion Criteria: * Symptoms OAB for 3 months or longer * At least 3 urgency episode in last 3 days * Symptoms of OAB as verified by the screening 3-day bladder diary, defined by: * Number of micturition ≥8 times/day * Number of urgency episodes in 3 days ≥3 Exclusion Criteria: * Significant stress incontinence or mixed stress/urge incontinence * Subject with indwelling catheters or practicing intermittent self-catheterization * Symptomatic urinary tract infection, chronic inflammation * Diabetic neuropathy * Subjects who are prohibited from taking solifenacin as contraindications * Drug or non-drug treatment for OAB was started, quitted or changed in 4 weeks * Participation in any clinical trial in 30 days except for Part-1 of RESORT